Consider the following Java code:

interface I { long f1(); long f2(); }

abstract class C implements I { public long f1() { return 5; } } class C2 extends C {

public long f1() { return 99; }

public long f2() { return f1() + 33333333 *super.f1(); }

}

class C3 extends C2 { public long f1() { return 88888888; } }

//... in some other class, perhaps in a main() method ... final I x = new C3(); final I y = new C2();

a. What are the static (compile-time) and dynamic (runtime) types ofx?Static: Dynamic:

b. What are the static and dynamic types ofy?Static: Dynamic:

c. Why must class C be declaredabstract?