Which command is used to stop the OpenLDAP service running on a server?

The command to stop the OpenLDAP service is correctly identified as involving the service command in conjunction with slapd, which is the name of the OpenLDAP daemon process. The command service slapd stop specifically instructs the system to stop the slapd service gracefully. This is a common practice in managing services on systems that use the System V init system or similar service management frameworks.

Using service slapd stop is preferred because it adheres to the standard practices for service management across various Linux distributions, making it portable and easy to remember for administrators. The command ensures that any ongoing operations managed by slapd are properly terminated, and it allows for a clean shutdown of the service.

In contrast, the other options either do not exist as valid commands or do not follow the convention for managing services on Linux systems.