Which chown command will change the ownership to dave and the group to staff on a file named data.tx

Which chown command will change the ownership to dave and the group to staff on a file named data.txt?

A.
chown dave/staff data.txt

B.
chown -u dave -g staff data.txt

C.
chown -user dave -group staff data.txt

D.
chown dave:staff data.txt