A casual LTI system is described by the difference equation 2y[n] = ay[n - 2] - 2x[n] + βx[n -1] The system is stable only if

A casual LTI system is described by the difference equation 2y[n] = a

1.	A casual LTI system is described by the difference equation 2y[n] = ay[n - 2] - 2x[n] + βx[n -1] The system is stable only if
A.	\|a\| = 2 \|β\| < 2
B.	\|a\| > 2 \|β\| > 2
C.	\|a\| < 2 any value of β
D.	\|β\| < 2, any value of a
Answer» D. \|β\| < 2, any value of a