多項選擇題

Given the following code, which method declarations, when inserted at the indicated position, will not cause the program to fail compilation?()  
public class Qdd1f {  
public long sum(long a, long b) { 
return a + b; 
}  
// insert new method declaration here 
}  

A.public int sum(int a, int b) { return a + b; }
B.public int sum(long a, long b) { return 0; }
C.abstract int sum();
D.private long sum(long a, long b) { return a + b; }
E.public long sum(long a, int b) { return a + b; }

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