Assertion (A): For identical coherent waves, the maximum intensity is four times the intensity due to each wave.
Reason (R): Intensity is proportional to the square of amplitude.
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, but R is true.
