Question

When authors say that they used a 2x2 mixed design, what do they mean?
a. There are two between-groups DVs with 2 levels
b. There is one between-groups DV with 2 levels, and one within-group DV with 2 levels
c.There is one between-groups IV with 2 levels, and one within-group IV with 2 levels
d. There are two between-groups IVs with 2 levels
e. There are two within-groups IVs with 2 levels