A relief against parties and persons claiming under them by subsequent title, for specific performance of a contract, may be enforced under

Option (1) is incorrect: Section 12 of the Specific Relief Act deals with specific performance of a part of contract. Option (2) is correct: Section 19 of the Specific Relief Act talks about relief against parties and persons claiming under them by subsequent title. Option (3) is incorrect: Section 18 of the Specific Relief Act deals with non-enforcement, except with variation. Option (4) is incorrect: Section 8 of the Specific Relief Act deals with liability of person in possession, not as owner, to deliver to persons entitled to immediate possession.