Explanation:

- According to Section 26 of the Indian Contract Act, 1872, any agreement in restraint of marriage of any person, other than a minor, is considered void.

- Such agreements are against public policy and freedom of marriage.

- Option 1: Valid Contract — An agreement in restraint of marriage is not enforceable, so not a valid contract.

- Option 2: Voidable Agreement — It is not voidable, but absolutely void from the beginning.

- Option 3: Void Contract — This is the correct answer. The agreement is void by law.

- Option 4: None of the above — Since option 3 is correct, this is not applicable.