A Systems Administrator Has Recently Purchased and Installed a Large

Multiple Choice

A systems administrator has recently purchased and installed a large electronic signage screen for the company's parking garage. The screen's management software was installed on a server with a public IP address to allow remote management. The systems administrator is now troubleshooting an issue with the screen displaying unknown, random, and inappropriate messages. Which of the following is MOST effective in resolving this issue?

A) Changing the management software's default credentials
B) Disabling unnecessary services from the server and management software
C) Changing the management software's default port
D) Replacing the management software's self-signed certificate with a valid certificate