Possible error in Security+ practice exam?

felix7felix7 Member Posts: 25 ■□□□□□□□□□
I'm going through the practice exam right now. Here is the question :

12. FTP data (ftp data channel) normally uses TCP port?
a. 20
b. 21
c. 23
d. 25
e. 26
f. 29

Answer : a) 20

I thought FTP uses port 21, no? I know sometimes it's both but mainly port 21.

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