An excerpt from ftp(1)…

"-A Force active mode FTP.  By default, ftp will try to use passive
mode FTP and fall back to active mode if passive is not supported
by the server.  This option causes ftp to always use an active
connection."

The modes and commands that start them…

Active: PORT, LPRT, EPRT
Passive: PASV, LPSV, EPSV