Assertion (a): In waiting line model, it is assumed that arrival rate is described by a Poisson probability distribution.
Reason (R): The arrival rate is a probabilistic variable in queue discipline is first come first serve(d)
(a) Both A and R are true but R is not a correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true