Verbal Reasoning - Verification of Truth - Discussion

If we're talking about old bulbs, then glass is important just like filament, If we're talking about LED bulb, then there's no filament in that.

Well, according to me, it would be D.

It depends on the material you intend to use for the bulb.

I too think it should be option D.

Thanks all.

I think it should be D because LED does not have a filament.

Glass: All traditional bulbs (incandescent, fluorescent, LED) are enclosed in a glass or transparent shell—this is essential for protecting internal components and allowing light to shine through.
Current: A bulb needs current to work, but it doesn’t always have current, like when it's switched off or unplugged.
Filament: Only incandescent bulbs have filaments. LED and fluorescent bulbs don’t.
Light: A bulb is designed to emit light, but it doesn’t always have light (e.g., when turned off or burnt out).
So, glass is the correct answer because it is a constant physical component of all standard bulbs.