In the figure shown, the wedge is fixedand the masses are released from rest. The coefficient of friction between A and the incline is `mu_(1)` and B and the incline is `mu_(2)`. Then which of the following sentence is (are) correct
(I) normal reaction between A and B can never be zero
(II) normal reaction between A and B is zero only if `mu_(1) = mu_(2)`
A. I only
B. II only
C. both I and II
D. none
