Answer: Reference type and instanceof operator : Questions « Operators « SCJP

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B.

public class MainClass{
    public static void main(String[] argv){
        String a = "a";
        
        System.out.println(a instanceof a);
    }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	a cannot be resolved to a type

	at MainClass.main(MainClass.java:5)