Question

What are possible candidate keys for following relationR = (A, B, C, D, E).A ?BCCD ?EB? DE? A
A. OAB, CD , DE
B. O A, BC , DE
c. O
A, BC, CD, E
D. O
A, BC, CD, DE.​

Answer 1

Answer:

I don't know

I don't understand why your question

Answer 2

Answer:a

Explanation: