Assertion : In ` x = A cos omega t`, the dot product of acceleration and velocity is positive for time interval `0 lt t lt (pi)/(2omega)`. Reason : Angle between them is `0^(@)` .
A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C. If Assertion is true, but the Reason is false.
D. If Assertion is false but the Reason is true.