What is the correct syntax to disable the FTP ALG in the application custom-ftp?

You created a new application named custom-ftp for FTP traffic, but you do not want the FTP ALG to be used. You have other applications using the FTP ALG, and you want to make sure those applications are not affected

What is the correct syntax to disable the FTP ALG in the application custom-ftp?

A.
set applications custom-ftp application-protocol ignore ftp

B.
set applications application custom-ftp application-protocol ftp none

C.
set applications application custom-ftp application-protocol ignore

D.
set applications application custom-ftp ignore ftp