If the variance x2 of d(n) = x(n) - x(n - 1) is one-tenth the varianc – McqOptions

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1.	If the variance _x² of d(n) = x(n) - x(n - 1) is one-tenth the variance _x² of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function R_xx(x)/ _x² at k = 1 is
A.	0.95
B.	0.90
C.	0.10
D.	0.05
Answer» D. 0.05

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