In the Solaris 10 operating system, when only ordinary users can ftp to the network management server, which file should be modified so that the root user can also remotely ftp to the server?

In the Solaris 10 operating system, when only ordinary users can ftp to the network management server, which file should be modified so that the root user can also remotely ftp to the server?
A . /etc/ftpusers
B . /etc/services
C . /etc/system
D . /etc/defaultrouter

Answer: A