With reference to the Electromagnetic Field (EMF), consider the following statements:
1. It is produced only from natural sources.
2. Electromagnetic fields are present everywhere in the environment.
3. Electromagnetic fields are a combination of invisible electric and magnetic fields of force.
Which of the statements given above is/are correct?
1
1 and 2 only
2
3 only
3
2 and 3 only
4
1, 2 and 3