2 Marks Question 2 Consider the relation schema R A B C D E and the following set of Functional Dependencies (FDs): AB CD 2.1 What are the (candidate) keys of R? Justify your answer (i.e., show the main steps and your working (1 Mark) 2.2 What is a minimal cover of ? Justify your answer (ie , show the main steps and your working used for (1 Mark) used for finding all the keys). finding a minimal cover)