Which among the following are the stable discrete time systems?1. y(n) = x(4n)2. y(n) = x(-n)3. y(n) = ax(n) + 8 4. y(n) = cos x(n)

Which among the following are the stable discrete time systems?1. y(n)

1.	Which among the following are the stable discrete time systems?1. y(n) = x(4n)2. y(n) = x(-n)3. y(n) = ax(n) + 8 4. y(n) = cos x(n)
A.	1 & 3
B.	2 & 4
C.	1, 3 & 4
D.	1, 2, 3 & 4
Answer» E.

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Which among the following are the stable discrete time systems?1. y(n) = x(4n)2. y(n) = x(-n)3. y(n) = ax(n) + 8 4. y(n) = cos x(n)

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