Suppose a real, stationary random signal x(n) has zero mean with autocorrelation. Let y[n]=x[n]cos(wn). What is the expected value of
y[n]?

A) E[y[n]]=0
B) E[y[n]]=x[n]
C) E[y[n]]=cos(wn)
D) E[y[n]]=x[n]cos(wn)