Electronic Devices - Transistor Bias Circuits - Discussion

The answer is incorrect. Relay driver circuits from a solid compatible source does not need full base biasing. A series resistor with a base grounding resistor is always desirable. If the Vcc voltage is above the relay actuation voltage, then an emitter resistor will be used to take the remaining voltage drop.

This assumes the input on signal is equal to or less than Vcc, and, that Vcc is near the actuation voltage of the relay. Coil clamping is desirable, but not mandatory. The reason you want to carefully calculate Re (if needed) is because you want the transistor to be in saturation to reduce power consumption of the transistor, and to optimize input impedance.

Remember that the input impedance is equal to the base side thevenin resistance in parallel with the base resistance x Hfe (Bdc).

Because transistor action Ic = BIb is required to drive load.