With reference to radioisotope thermoelectric generators (RTGs), consider the following statements:

1. RTGs are miniature fission reactors.

2. RTGs are used for powering the onboard systems of spacecrafts.

3. RTGs can use Plutonium-238, which is a by-product of weapons development.

Which of the statements given above are correct?

1. (a) 1 and 2 only
2. (b) 2 and 3 onlyCorrect answer
3. (c) 1 and 3 only
4. (d) 1, 2 and 3

Answer: (b)