Consider the following statements:
1. Heat is generated in a nuclear reactor by fission of U – 235 by neutron.
2. Percentage of U – 238 in natural Uranium is around 0.71.
3. Plutonium is not a naturally occurring nuclear fuel.
Which of the statements given above is/are correct?
(a) 1 only (b) 2 and 3 only
(c) 1 and 3 only (d) 1, 2 and 3