A$.$ In the lab you designed a common emitter amplifier to achieve an operating point of $1$ mA with a $2$N$3904.$ Give the schematic diagram and all resistor values of the circuit you used for $($i$)$ single resistor $($simple$)$ biasing and for $($ii$)$ stabilized biasing. For each of these two biasing schemes, approximately how much did the operating point change when the transistor was cooled to $-50$ C and why was this so$?$