$$4+7-1=10$$ 
Anna is lining up to get some ice-cream. Counting from the front, she is the $$4$$\textsuperscript{th}~in the line. Counting from the back, she is the $$7$$\textsuperscript{th}. How many people are there lining up?~\uline{~~~~~~~~~~}~ 

a: $$9$$ 
b: $$10$$ 
c: $$11$$ 
d: $$12$$ 