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49 50 Given two reference variables t1 and t2 if t1 t2 is true, t1.equals(t2) must be A. true C B. false If an object is an instance of class A, and class A is a subclass of class B, then the object is also an instance of class B. C True C False Analyze the following code: public class Test public static void main(StrngO args) Object al new A Object a2-new Object 0; System out. println(al); System out. pri tin (a class A int public string tostrngo retum As x is x; A. When executing System.out.println(a1), l the tostringo method in the object class is invoked. B. When executing System.out.println(a2), the tostringo method in the object class is invoked C. When executing System.out.println(a1), r the tostringo method in the A class is invoked. D. The program cannot be compiled, because System.out.println(a1) is wrong and it should be replaced by System out.println(a1.toString0);

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