Consider the following relations and sets of functional dependencies that hold in those relations.

Q2.2 R2(A, B, C, D) with FDs AD-C,C- A, and D B. Q2.2.1 (3 points) What are all the non-trivial FDs that follow from the given FDs? Q2.22 (3 points) What are all the keys (i.e., candidate keys) of R2? Q2.23 (3 points) What are all the superkeys for R2