Researchers are putting Mac and PC to the test based on the following claims of their respective PR teams.

Mac: "Mac users save time because they find Mac computers so easy to use"$$

PC: $$PC computers are so easy to use that everyone saves time when using a PC$.$

Two$-$hundred participants $($identifying as either Mac or PC users$)$ were randomly assigned to either complete tasks using a Mac or PC$.$

Table $1.$

Effects of User Type and Brand on Task Completion Speed

Note. Time $($seconds$)$ to complete task. N $=50$ participants in each cell of the study design.

Which of the following omnibus tests from a factorial ANOVA most effectively test the PR teams' claims?

The main effect of User Type, and the interaction

The interaction

The main effect of Brand, and the interaction

Both main effects, and the interaction