Under Section 28 of the Indian Contract Act, 1872, which of the following agreements is VALID?

Section 28 declares void, to that extent, every agreement by which any party is restricted absolutely from enforcing his rights under or in respect of a contract by the usual legal proceedings in the ordinary tribunals, or which limits the time within which he may thus enforce his rights, as well as every agreement which extinguishes the rights of a party or discharges a party from liability under a contract on the expiry of a specified period. Exception 1 saves a contract to refer to arbitration any dispute which may arise between the parties, and Exceptions 2 and 3 save contracts to refer questions already arisen and contracts made in the course of a reference to arbitration.