Answer: a
Step-by-step explanation:
An indenture is a legal contract that reflects or covers a debt or purchase obligation. It specifically refers to two types of practices: in historical usage, an indentured servant status, and in modern usage, it is an instrument used for commercial debt or real estate transaction.
An indentured servant or indentured laborer is an employee (indenture) within a system of unfree labor who is bound by a signed or forced contract (indenture) to work for a particular employer for a fixed time. The contract often lets the employer sell the labor of an indenturee to a third party.