What action should you take immediately after detecting a new user account created in the Administrators group via remote command?

Deleting the newly created user account immediately is a decisive action to take when suspicious activity, such as an unauthorized user account being added to the Administrators group, is detected. The presence of a new account in a highly privileged group raises significant security concerns, as it could indicate a potential security breach or malicious intent.

By removing the account, you are actively mitigating the risk associated with potential exploitation or unauthorized access to the system. It helps to prevent an attacker from leveraging that access for malicious activities such as data theft, system compromise, or further infiltration of the network.

While other options may be valid considerations as part of an overall security protocol, they do not directly address the immediate threat posed by the unauthorized account. Auditing recent changes in the Administrators group, for instance, is a critical follow-up task but does not provide an immediate solution to the risk present. Enforcing multi-factor authentication or implementing network segmentation are preventative measures that should be in place, but they don't address the current issue of an unauthorized account being created. Therefore, immediately deleting the account is a proactive step to safeguard the system from immediate threats.