21. For the following sytem,

When X1(s)=0, the transfer function \(y(s)\over x_2(s)\) is

(A) \(s+1\over s^2\)

(B) \(1\over s+1\)

(C) \(s+2\over s(s+1)\)

(D) \(s+1 \over s(s+2)\)

Hint: 
Explanation: 

Answer-(D) \(s+1 \over s(s+2)\)
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