Final answer:
To terminate a user's access to practice management software Deactivation is the appropriate choice as it revokes login privileges and software access.
Step-by-step explanation:
To end the user access to the practice management software the correct option is D) Deactivation. This option is commonly used to disable a user account or revoke access privileges ensuring that the user can no longer log in or utilize the software's features. Deactivation is often found in the administrative settings of the software where an administrator has the capability to manage user accounts and permissions.