How can I find POS from given SOP?

Question

Here are the sets of POS

1. C + B’D
2. (AC) + (B’CD) + (AB’D)
3. (BC) + (A’CD’) + (A’B’C’D)
4. (BC) + (ACD’)
5. (B’C) + (A’CD’) + (ACD)

This (') stand for NOT. Please help!

Answer 1

Here are the answers I have got. Is this correct?

1. (C’) (B+D’)
2. (A’+C’) (B+C’+D’) (A’+B+D’)
3. (B’+C’) (A+C’+D) (A+B+C+D’)
4. (B’+C’) (A’+C’+D)
5. (B+C’) (A+C’+D) (A’+C’+D’)