15 Pts] Using K-map find the prime implicants (PI) and the essential prime implicants (EPI) of the following logic functions: 4) f(A,B,C,D)=m(1,2,4,5,6,7,12,14) 5) f(A,B,C,D)=m(0,5,10,11,12,13,15) 6) f(A,B,C,D)=m(0,1,2,4,5,10,11,13,15)