Final answer:
After installing the DHCP server role, the service must be restarted to ensure it is running properly and to apply any new configurations, which allows it to start assigning IP addresses to clients on the network.
Step-by-step explanation:
After the installation of the DHCP server role, it is necessary to restart the DHCP service primarily to ensure that the DHCP service is running correctly and all configurations are properly initialized. Restarting is a standard procedure that finalizes the installation, loads the newly installed files into memory, and applies any specified configurations or credentials to the service.
Therefore, the correct answer is:
c. To ensure the DHCP service is running
This action ensures that the service starts to function as expected and can begin the process of assigning IP addresses to client machines on the network.