question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: Consider the infinitely long chain of resistors shown below. What is the resistance between terminals a and b if R=1?
  Choices:
  (A) 1.46
  (B) 73
  (C) 0
  (D) 0.73