If I conduct a study looking at the effect of music on mood, and I have separate groups of participants listen to classical, rock, and pop music,

If I conduct a study looking at the effect of music on mood, and I have separate groups of participants listen to classical, rock, and pop music, which of the following statements is true about this study?

There are 3 different levels of the independent variable.

The factor in this study is the type of music.

This is a between-subjects design.

All of the above