Consider the following statements regarding nuclear fusion technology:

1. For fusion to occur, the nuclei need to be exposed to extremely high temperatures to overcome their repulsion and fuse together.

2. While deuterium is abundant in seawater, tritium does not occur naturally and is difficult to produce.

3. Magnetic confinement fusion involves trapping plasma using strong magnetic fields to prevent it from touching the reactor walls.

Which of the statements given above is/are correct?