The polar plot of a conditionally stable system is shown in Figure P9.4 for a specific gain K. (a) Determine whether the system is stable, and find the number of roots (if any) in the right-hand $s$-plane. The system has no poles of $G_c(s) G(s)$ in the right half-plane. (b) Determine whether the system is stable if the -1 point lies at the dot on the axis.