A stable Linear Time Invariant (LTI) system has a transfer function...

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A stable Linear Time Invariant (LTI) system has a transfer function $${\text{H}}\left( {\text{s}} \right) = \frac{1}{{{{\text{s}}^2} + {\text{s}} - 6}}.$$ 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 option is

A. s + 3

B. s - 2

C. s - 6

D. s + 1

Answer: Option B

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