43. A stable linear time invariant (LTI) syste...

43. A stable linear time invariant (LTI) system has a transfer function \(H(s)={1\over s^2+s-6}\) . To make this system causal it needs to be cascaded with another LTI system having a transfer function H1(s). A correct choice for H1(s) among the following options is

(A) s + 3

(B) s - 2

(C)  s - 6 

(D) s + 1

Hint: 

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