椭圆的短轴的一个端点到一个焦点的距离为5,焦点到椭圆中心的距

椭圆的短轴的一个端点到一个焦点的距离为5,焦点到椭圆中心的距离为3,则椭圆的标准方程是      (    )

       A.=1或=1     B.=1或=1

C.=1或=1      D.椭圆的方程无法确定

答案

C

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