Which one of the following statements with regard to contract is not correct?

Performance of the conditions of a proposal, or the acceptance of any consideration for a reciprocal promise which may be offered with a proposal, is an acceptance of the proposal

An agreement made without consideration can be enforced by law as contract if it is in writing between parties standing in near relationship and is made on account of natural love and affection

Every agreement in restraint of the marriage of any person, other than a minor, is void

An acceptance may be revoked at any time before the communication of the acceptance is complete as against the acceptor, but not afterwards