A contractor, as described below, is:

(a) Prime contractor. Any person holding, and for enforcement purposes any person who has held, a contract subject to the Executive Order, Section 503 or 38 U.S.C. §4212.

(b) Subcontractor. Any person holding, and for enforcement purposes any person who has held, a subcontract subject to the Executive Order, Section 503 or 38 U.S.C. §4212.

(c) First-tier subcontractor. A subcontractor holding a subcontract with a prime contractor.

A subcontractor, as described below, is:

Any person holding a subcontract, or for enforcement purposes any person who has held a subcontract, subject to the Executive Order, Section 503 or 38 U.S.C. 4212. A subcontract is:

Any agreement or arrangement between a contractor and any person (in which the parties do not stand in the relationship of an employer and an employee):

(a) for the furnishing of supplies or services or for the use of real or personal property, including lease arrangements, which, in whole or in part, is necessary to the performance of any one or more Government contracts; or

(b) under which any portion of the contractor's obligation under one or more Government contracts is performed, undertaken or assumed. See 41 CFR 60-1.3.