The diagram below represents the cell cycle.



When cells leave the cell cycle, they exit during G1 phase and then enter G0 phase, a resting period. Most normal cells can leave G0 phase and reenter the cell cycle at G1 phase before entering S phase. Cancer cells are different because they do not enter G0 phase and are likely to do which of the following?
Mutate during G1 phase
Repeat the cell cycle continuously
Die after completing mitosis
Fail to complete S phase