8. Let f(z)=z/(z2+9), and C be a circle|z - j2|=4 in counterclockwise direction. The evaluation of. Then which of the following statements is correct? (A) a＜0,β＞0 (B) a ＞0,β＞0 (C)a=0,1＜β＜4 (D) a＞0, -3＜β＜4 (E) None of the above statements are correct.

4.Consider the following three systems, where [n] or x(t) is the system input, y[n] or y(t) denotes the system output, and I.Which of the following statements is correct? (A) I is time-invariant, II is linear, Ill is causal. (B) I is memoryless, II is causal, III is nonlincar. (C) I is stable, II is linear, III is memoryless. (D) I is causal, II is memoryless, III is linear. (E) None of the above statements are correct.

8. Let f(z)=z/(z²+9), and C be a circle|z - j2|=4 in counterclockwise direction. The evaluation of. Then which of the following statements is correct?
(A) a＜0,β＞0
(B) a ＞0,β＞0
(C)a=0,1＜β＜4
(D) a＞0, -3＜β＜4
(E) None of the above statements are correct.

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