Multiple choice

Let P be linearity, Q be time-invariance, R be causality and S be stability. A discrete time system has the input-output relationship, Y(n) = $ \begin{cases} x(n), & n \ge 1 \\ 0 & n=0 \\ x(n+1), & n \le -1 \end{cases}

$ where x(n) is the input and y(n) is the output. The above system has the properties

  1. P, S but not Q, R

  2. P, Q, S but not R

  3. P, Q, R, S

  4. Q, R, S but not P

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A Correct answer
Explanation