A plant transfer function is given as $G(s)= \bigg( K_p+ \frac{K_1}{s} \bigg) \frac{1}{s(s+2)}$. When the plant operates in a unity feedback configuration, the condition for the stability of the closed loop system is
- $K_p>\frac{K_1}{2}>0 \\$
- $2K_1>K_p>0 \\$
- $2K_1<K_p \\$
- $2K_1>K_p$