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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

1. $K_p>\frac{K_1}{2}>0 \\$
2. $2K_1>K_p>0 \\$
3. $2K_1<K_p \\$
4. $2K_1>K_p$