$(20$p$)$ A bistable multivibrator is shown in below, where the Opamp has power supplies of $+-5V$ and the diode is ideal with a turn$-$on voltage of $1$ V $($the diode becomes a short circuit with a $1$ V drop when it is forward biased by $1$ V $).$

Draw the voltage transfer characteristics for this circuit on the plot. You may neglect the current in the $1$ M resistor when the diode is on$,$ its only purpose is to pull $V+$ to ground when the diode is off.