Answer:
d. privileged user account
Step-by-step explanation:
Based on the specifications provided on the account management policy, it seems that the policy should specify a privileged user account for service technicians from corporate partners. This is because a privileged account provides the same level of security as a regular user account but allows for greater availability and uses such as installing and removing software, upgrading the operating system, or even changing settings in the system. Which are all tasks that a service technician would need access to.