Consider the following statements:1. The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction.2. In a nuclear reactor, the reaction is controlled, while in nuclear bombs, the reaction is uncontrolled.3. In a nuclear reactor, all operating reactors are ‘critical’, while there is no question of ‘criticality’ in case of a nuclear bomb.4. Nuclear reactors do not use moderators, while nuclear bombs use them.Which of the above statements about operational principles of a nuclear reactor and a nuclear bomb is / are correct?

• A. 1 and 3
• B. 2 and 3
• C. 4 only
• D. 1 and 4