Extra exam question E7A05

WhyAn astable multivibrator continuously alternates between two states without an external clock signal. An astable multivibrator has no stable output state at all, it continuously and automatically switches back and forth between its two states on its own, without needing an external clock signal to trigger each transition, answer D. A monostable multivibrator has one stable state and one temporary state, and J-K and T flip-flops need an external clock or trigger pulse to change state, they don't free-run.