I Is an Interface, a Is an Abstract Class, and B

Essay

I is an interface, A is an abstract class, and B and C are regular classes. C inherits from B (i.e., B is the superclass of C). List all the errors.
A a = new A( ); // 1
B b1 = new B( ); // 2
C c1 = new C( ); // 3
I i = new I( ); // 4
B b2 = new C( ); // 5
C c2 = new B( ); // 6