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單項選擇題

1. public class A { 
2. 
3. private int counter = 0; 
4. 
5. public static int getInstanceCount() { 
6. return counter; 
7. } 
8. 
9. public A() { 
10. counter++; 
11. } 
12. 
13. } 
Given this code from Class B: 
25.A a1 =new A(); 
26. A a2 =new A(); 
27. A a3 =new A(); 
28. System.out.printIn(A.getInstanceCount() );
What is the result?() 

A. Compilation of class A fails.
B. Line 28 prints the value 3 to System.out.
C. Line 28 prints the value 1 to System.out.
D. A runtime error occurs when line 25 executes.
E. Compilation fails because of an error on line 28.

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