What is the full form of LEDs?

Light Emitting Diodes

The correct answer is option 2. Light Emitting Diodes.

LEDs (Light Emitting Diodes) are available in many colours such as red, green, yellow, blue, white and are increasingly being used for many applications.

For example, in traffic signal lights.

LEDs are increasingly being used for lighting.

A cluster of white LEDs grouped together forms a LED light source.

LED light sources consume less electricity and have longer lifetime than light bulbs and fluorescent tubes.

Hence these are gradually becoming the preferred lighting source.