What is not an element of legitimate contracting? (2012 BAR)

a. The contract calls for the performance of a specific job, work or service;
b. It is stipulated that the performance of a specific job, work or service must be within a definite predetermined period;
c. The performance of a specific job, work or service has to completed either within or outside the premises of the principal;
d. The principal has control over the performance of a specific job, work or service.