Assertion: The `v-t` graph perpendicular to time axis is not possible in practice.
Reason: Infinite acceleration cannot be realised in practice.
Options:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.