Frank owes Jim $100. Frank contracts with Ron to pay $100 and notifies Jim of the contract by fax. Jim replies by fax that he agrees. After Frank received Jim;a reply, Ron and Frank send Jim a fax stating that they have decided to rescind the contract. Jim' s rights under the contract ___________

a. vested when Jim learned of the contract and manifested assent to it.

b. voted when Frank and Ron formed their contract.

c. will not vest, because Ron and Frank rescinded their contract.

d. could never vest, because Jim is an incidental beneficiary.