Answer-For a revocation to be effective when should it be made?

Q: Answer-For a revocation to be effective when should it be made?

Section 5. Revocation of proposals and acceptances A proposal may be revoked at any time before the communication of its acceptance is complete as against the proposer, but not afterwards. An acceptance may be revoked at any time before the communication of the acceptance is complete as against the acceptor, but not afterwards.