Which is the first line to fail to compile? 

A. r1

B. r2

C. r3

D. r4

E. r5

F. None of the above

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class Tool { } private void repair() {} void use() {} } // r1 // r2 class Hammer extends Tool { private int repair() { return 0; } // r3 private void use () {} // r4 public void bang() {} // r5