In the following hierarchy, given that Class1 is abstract and overrides method1 and method2, which method(s) class2 must override in order to be concrete?

MORE THAN ANSWER IS CORRECT

a.method5

b.method2

c.method3

d.method1

e.method4

ert 0:30 > Interface1 +method1(num:double) > Interface +method4(num:double) > Interface3 +method3(num:double) > Interface2 +method2(num:double) italic Class1 +method5(num:int) Class 2 +method60) Class 3 +method70)