GP Corp Had Been Contracted by the Public Services Department of of Kingston

Multiple Choice

GP Corp. had been contracted by the public services department of Kingston to install monitoring systems at all public places. This was to be done in two phases and the city had the right to terminate the contract. GP had plans to use a subcontractor, Rex, whom they usually hired for the last phases of projects executed by them. After two weeks of the work, the city of Kingston found that things were not going according to plan and terminated GP's contract. Under these circumstances:

A) Rex can sue the public services department of Kingston because he is a third-party donee beneficiary.
B) Rex cannot sue the public services department of Kingston because he is only an incidental beneficiary.
C) Rex can sue the public services department of Kingston because he is involved in a novation.
D) Rex cannot sue the public services department of Kingston because he is a creditor beneficiary.