What command would do the trick?

You’re administering a Linux server whose previous admin had the nasty habit of creating temporary files called ‘ff’ all over the file system, some of them quite big, without ever removing them.
You decide to clean up the mess. What command would do the trick?
(choose the best answer)

A.
find ff -type f -exec rm {};

B.
find ff -type f -exec rm {} ;

C.
find / -name ff -exec /bin/rm {};

D.
find / -name ff -exec /bin/rm {} ;

Explanation:
ACTIONS

-exec command:
Execute command; true if 0 status is returned.
All following arguments to find are taken to be arguments to the command until an argument consisting of `;’ is encountered. The string `{}’ is replaced by the current file name being processed everywhere it occurs in the arguments to the command, not just in arguments where it is alone, as in some versions of find. Both of these constructions might need to be escaped (with a `’) or quoted to protect them from expansion by the shell. The command is executed in the starting directory.