You are managing an FTP server installed in Ubuntu Server. The server has created a very large log file, vsftpd.log. Which command is appropriate to search the log file for activity of the user charlie?
a. sudo cat /var/log/vsftpd.log
b. grep "charlie" /var/log/vsftpd.log
c. sudo grep "charlie" /var/log/vsftpd.log
d. cat /var/log/vsftpd.log
Answer: c. sudo grep "charlie" /var/log/vsftpd.log
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