Signals and Systems - Engineering

Q1:

Which one most appropriate dynamic system?

A y(n) + y(n - 1) + y(n + 1)

B y(n) + y(n - 1)

C y(n) = x(n)

D y(n) + y(n - 1) + y(n + 3) = 0

ANS:A - y(n) + y(n - 1) + y(n + 1)

Because present output of y(n) depend upon past y(n - 1) and future y(n + 1).