How to find candidate keys in this relation?

[shivajikobardan]

Homework Statement

finding candidate keys

Relevant Equations

none

These are the FDs:
AB=>CD
C=>A
D=>B

My method of finding candidate keys is:

1) Look at RHS
2) Whatever isn't there could be a candidate key. (Find its closure).
But here everything is in RHS. So, I'm confused.
Can you share a better method to find candidate keys without getting too verbose(DBMS is too verbose).

 

[shivajikobardan]

my issue fixed after watching this video Qno.3