A.15 B.8 C.7 D.1
A.F=B´C´+AC+A´B B.F=A´C´+BC+AB´ C.F=A´C´+BC+AB´+A´C´ D.F=B´C´+AC+A´B+BC+AB´+A´C´
A.1000 B.1001 C.1010