Which two code fragments, when inserted at // insert code here, enable the code to compile and print 12?

Given: Which two code fragments, when inserted at // insert code here, enable the code to
compile and print 12?

A.
Calc c = new Calc(); int n3 = c.findMid(n1,n2);

B.
int n3 = super.findMid(n1,n3);

C.
Calc c = new Mid(); int n3 = c.findMid(n1, n2);

D.
Mid m1 = new Calc(); int n3 = m1.findMid(n1, n2);

E.
int n3 = Calc.findMid(n1, n2);