Convert the above ER diagram to relations in the normal manner, and then identify which of the following is a relation schema.

A$.$ A$($aaa$,$ bbb$,$ccc$)$

B$.$ B$($bbb$,$ccc$,$ e$)$

c$.$ S$($bbb$,$ccc$)$

D$.C(aaa,CC{C}_{,}f)$