The correct answer is D. All above.
An electric filament bulb can be worked from D.C. supply only, A.C. supply only, and Battery supply only.
A filament bulb is a type of light bulb that uses a thin wire filament to produce light. The filament is made of a material that has a high resistance to electricity, such as tungsten. When electricity flows through the filament, it heats up and emits light.
The filament in a bulb can be heated by either D.C. or A.C. current. D.C. current is a type of electricity that flows in one direction. A.C. current is a type of electricity that flows in alternating directions.
A battery can also be used to power a filament bulb. A battery is a device that stores electrical energy. When a battery is connected to a circuit, it provides a source of electricity.
The filament in a bulb can be heated by either D.C., A.C., or battery power. Therefore, the correct answer to the question “An electric filament bulb can be worked from” is D. All above.