Does the filament of a bulb have constant resistance, constant voltage or constant current?

Question

I would think it's constant current. But can someone logically explain why? I can't understand it much.

Answer 1

resistance changes with temperature, and temperature changes dramatically as the bulb heats up.

Current changes dramatically from turn on to heated condition.

Voltage remains constant from the supply, usually.

Answer 2

What about for an LED? Wouldn't that at least have constant current? I'm asking this because for an assignment where we had the previously stated question I put constant current which was marked correct. But with your help and research I've realized it should actually be constant voltage. So maybe I misinterpreted the question, if it was meant for LED filament then would it have constant current?