With reference to radioisotope thermoelectric generators (RTGs),
consider the following statements:
RTGs are miniature fission reactors.
RTGs are used for powering the onboard systems of spacecrafts.
RTGs can use Plutonium-238, which is a by-product of weapons development.
Which of the statements given above are correct?
a. 1 and 2 only
b. 2 and 3 only
c. 1 and 3 only
d. 1, 2 and 3