user_prompt: ## Instruction:
  You enter a hall that has three parts: a center room, a left room, and a right room. The left and right rooms are separated by shield walls that destroy portals or cubes when touched. The center room has a button, a cube slot, and a ball slot. The left room has a laser source and two laser slots, one in the front and one in the back. The right room has a small button at the end which triggers a cube to be made, dropped on a jumper that points at the shield wall connecting the right room to the center room. More details in images.
  Pressing the button removes the shield wall to the right room (as long as pressed). Also, a vertical wall appears in the center room close to the entrance.
  The shield wall to the left room is removed as long as the cube slot is activated.
  A ball is dropped in the left room when the laser hits the laser slot in the back.
  An elevated path appears in the center room when the laser hits the laser slot in the front in the left room.
  
  Below is a candidate solution:
  Step 1: Go step on the first button straight in front of you. This removes the shield wall on the right.
  Step 2: Shoot a blue portal inside the right room while standing on the button, then shoot an orange portal right next to the floor button and walk through the orange portal.
  Step 3: In the right room, shoot a blue portal right next to the small button in the back.
  Step 4: Press the small button and quickly go through the portal in the center room. Then, a cube will be shot from the right room into the center room. Make sure you stand in its trajectory and catch the cube mid-air.
  Step 5: Place the cube in the cube slot, which removes the shield wall on the left.
  Step 6: Walk to the left room and shoot a blue portal in the wall on the right.
  Step 7: Walk to the center room and place the cube on the button.
  Step 8: Shoot an orange portal into the right room way in the back such that the laser slot in the end of the left room is hit. This releases a ball at the beginning of the left room.
  Step 9: Quickly grab the ball by walking through the shield wall into the left room before it rolls into the wall and gets destroyed.
  Step 10: Place the ball in a corner of the left room in the back where it does not roll away.
  Step 11: In the center room, place the cube on the cube slot to open the left shield wall.
  Step 12: Fetch the ball and place it in the ball slot in the middle room, which opens the final door.
  Step 13: Go to the left room and shoot a blue portal into the wall where the laser hits.
  Step 14: Go to the center room and stand close to the entrace to shoot an orange portal into the right room such that the laser hits the other laser slot we didn't use so far.
  Step 15: Place the cube on the button in the center room to make the two appearing walls permanent.
  Step 16: Create a blue portal on the white wall right over the entrance and an orange portal in the center room which you enter to walk across the elevated path to the opened exit door. Task solved.
  
  Please choose from the following options. Your response should end with "The final answer is [answer]." where the [answer] is the choice of A or B.
  A. Correct
  B. InCorrect