Which of the following commands makes /bin/foo executable by everyone but writable only by its owner?

Which of the following commands makes /bin/foo executable by everyone but writable only
by its owner?

A.
chmod o+rwx,a+rx /bin/foo

B.
chmod 577 /bin/foo

C.
chmod u=rwx,go=rx /bin/foo

D.
chmod 775 /bin/foo