Consider a relation R with five attributes. You are given the following dependencies:
A → D, A → E, DE → BC, B → A, D → C
Which of the following statement is/are true?
S1: A and DE are keys of R
S2: R is in 3NF
S3: R is in BCNF
1
S1 only
2
S1 and S2
3
S1, S2 and S3
4
S2 only