Hi, please check if the LTI systems are stable, and what is the transfer function H(s) for each system. Below are the pole-zero plots of four CT

Hi, please check if the LTI systems are stable, and what is the transfer function H(s) for each system. Below are the pole-zero plots of four CT casual LTI systems, and also assume that H(4) = 1 for the four cases, and the poles and zeros are all located at integer coordinates in the s-plane. Thanks!