A camera equipment manufacturing company called Next Generation Camera is experimenting to evaluate the impact of production line speed $($low$,$ medium, high$)$ and operator experience $($novice$,$ intermediate, expert$)$ on product defect rates.

Which of the following statements about interaction effects in this scenario is correct?

Interaction effects occur when the main effects of both factors are statistically significant.

Interaction effects occur when one factor's effect depends on the other factor's level.

Interaction effects occur when the effect of one factor does not depend on the level of the other factor.

$$ Interaction effects are only relevant when there is a significant main effect for one of the factors.