In a circular queue which can hold only six elements.

a$)$ When the queue is initialized, what are the values of F and R$?$

b$)$ After the operations shown below, what are the values of F and R$?$

enqueue$(5),$ enqueue$(10),$ enqueue$(15),$ enqueue$(20),$ enqueue$(25),$ enqueue$(30),$ dequeue$(),$dequeue$(),$enqueue$(35),$ enqueue$(40)$

c$)$ How do you tell the difference between an empty queue and a full queue?