47. With reference to the LED bulbs, which of the statements given below are correct?
1) LED stands for light-emitting devices (LED)
2) LED bulbs are energy-efficient
3) Lesser consumption of power by LED bulbs also means lesser emission of CO2, and thus reduced carbon footprints
4) LED bulbs are long-lasting
 

Select the correct answer using the codes given below:

1. 2 and 3

2. 1 and 2

3. 2, 3 and 4

4. 1, 2, 3 and 4

Correct Answer :

2, 3 and 4