Q. What is the difference between a CFL and an LED lamp?1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.2. The average life span of a CFL is much longer than that of an LED lamp3. A CFL is less energy-efficient as compared to an LED lamp.Which of the statements given above is/are correct?

1. 1 only
2. 1 and 3 only
3. 2 and 3 only
4. 1, 2 and 3