Able orally agreed to pay Carr $800 to restore Able's antique car within 18 months, even though it was possible for him to complete the restoration in 10 months. The agreement is: a. unenforceable, because it covers services with a value in excess of $500. b. unenforceable, because it covers a time period in excess of one year. c. enforceable, because personal service contracts are exempt from the Statute of Frauds. d. enforceable, because the work could be completed within one year.