What could be a reason for invoking vsftpd from (x) inetd?

A.
It’s not a good idea, because (x) inetd is not secure

B.
Running vsftpd in standalone mode is only possible as root, which could be a security risk

C.
vsftpd cannot be started in standalone mode

D.
(x) inetd has more access control capabilities

E.
(x) inetd is needed to run vsftpd in a chroot jail