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单选题
现有:  1.class Over  {  2.int dolt (long x)  {  return 3;  }      3.  }      4.  5. class Under extends Over  {      6.//insert code here      7.  }  和四个方法:  short dolt (int y)  {  return 4;  }  int dolt(long Xr long y)  {  return 4;  }      private int dolt(short y)  {  return 4;  }     protected int dolt (long x)  {  return 4;  }      分别插入到第6行,有几个可以通过编译?()
A

  1

B

  2

C

  3

D

  4


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