Answer:
The correct answer is b. an implied contract.
Step-by-step explanation:
The theory of implicit contracts refers to the fact that the relationship between employers and workers is governed, in addition to the "explicit" legal contracts signed between the two, by a multitude of tacit commitments established during the understanding between the two parties. Implied contracts are unwritten agreements and informal rules that companies have with their workers, and that, in many cases, are justified in the commitment to wage stability. In this theory, companies set wages within a broad and long-term strategy or stability of the employment relationship.