According to the circuit shown in the following Figure 11, calculate the frequency responseof iO/iS and find the poles and zeros. Please choose the correct descriptions.  
(A) 0.5 rad/s < pole < 1.5 rad/s
(B) 1.5 rad/s < pole < 2.5 rad/s
(C) 0.5 rad/s < zero < 1.5 rad/s
(D) 1.5 rad/s < zero < 2.5 rad/s