The operations that are ‘in-house’, or controlled entirely by the company establishing security for its...

Comprehensive Detailed Explanation:

In-house or proprietary security operations are those where the security team is employed and managed internally by the company. This contrasts with contract security operations (Answer A), where a third-party company provides and manages the personnel. Proprietary systems offer more direct oversight and integration into the company’s operational protocols.

Staffing operations (Answer C) is a general HR term.

Control operations (Answer D) refers to operational functions but not specifically security staffing.