What is the output of this code? class A{ void someMethod() { System.out.print("A"); } } class B extends A{ void someMethod() { System.out.print("B"); } } class C extends A{ void someMethod() { System.out.print("C"); } } A a = new BO; Bb = new BO; C C = new CO: Ad = new CO; a someMethod(); b.someMethod(); c.someMethod(): d.someMethod(); ABCA BBCC Runtime Error Compilation Error