Answer:
D.restrictive covenant.
Explanation:
Restrictive covenant is a clause in an employment contract, which prohibit employee from taking favor or benefit of ex employer´s brand, data, information, etc. This help the employer to protect its data and information from being misuse or used against them.
This clause also ristrict employee from working for a direct competitive company.
It also ristrict employee from poaching client or business from the ex employer´s company.
It also ristrict employee from being in direct contact with client or vendors.