A security team informs the Linux administrator that a specific server is acting as an open relay. To which of the following is the security team referring?
A. The server is running the SSH service and is open to the Internet, allowing outside sources to log into the server without source IP address filtering.
B. The server is acting as an unmanaged router, open to the Internet, and is allowing outside Internet traffic into the network with no filtering.
C. The server is acting as a web proxy and allowing outside unauthenticated sources to connect to the server, effectively hiding the source’s IP address for malicious activities.
D. The server has an email service configured to allow outside sources to send email to other external parties on the Internet without validation.
