In the discussion on nuclear fusion, What argument does Professor Simpson present regarding the use of laser technology in the process?
1) Lasers contribute to the efficiency of tritium reactors.
2) Fusion reactors can operate without the use of lasers.
3) Laser technology is impractical for nuclear fusion.
4) The cost of lasers outweighs the benefits in fusion research.
5) Laser technology eliminates the need for tritium fuel.