A security investigation revealed that malicious software was installed on a server using a server administrator's
credentials. During the investigation, the server administrator explained that Telnet was regularly used to log in.
Which of the following most likely occurred?


A. A spraying attack was used to determine which credentials to use
B. A packet capture tool was used to steal the password
C. A remote-access Trojan was used to install the malware
D. A dictionary attack was used to log in as the server administrator