Anetwork administrator discovers several unknown files in the root directory of his linux ftp server. oneof the files is a tarball, two are shell script files, and the third is a binary file is named "nc." the ftp server's access logs show that the anonymous user account logged in to the server, uploaded the files, andextracted the contents of the tarball and ran the script using a function provided by the ftp server's software. the ps command shows that the nc file is running as process, and the netstat command shows the nc process is listening on a network port. what kind of vulnerability must be present to make this remote attack possible? a. file system permissionsb. privilege escalationc. directory traversald. brute force login