For Q=0 , both the waves are completely out of phase then what will be the equation.

A. A(Q)= 2 a cos Q/2

B. A(Q)= 2a cosQ/2 din(kx-wt+Q/2)

C. A(Q)=y(x,t)= 2 a sin(kx-wt)

D. A(Q)=y(x,t)=2 a cos(kx-wt)