A system administrator notices that a previously dormant server is suddenly experiencing unusually high processor and memory usage. Simultaneously, there is a significant increase in outbound network traffic late at night when the server is usually idle. What could be the most likely explanation for this anomaly?
The server is participating in a botnet and engaging in data exfiltration.
The server is undergoing maintenance, which causes a spike in resource usage.
An update is installed on the server, causing high hardware resource usage.
A scheduled backup process is running, resulting in high outbound network traffic.