椭圆\( \dfrac {x^{2}}{25}+ \dfrac {y^{2}}{9} =1\)上一点\(P\)到两焦点的距离之积为\(m\)，当\(m\)取最大值时，\(P\)点坐标为\((\:\:\:\:)\)
A. \((5 , 0)\)，\((-5 , 0)\)
B. \(( \dfrac {2}{5}, \dfrac {3 \sqrt {2}}{2} )( \dfrac {5}{2},- \dfrac {3 \sqrt {2}}{2} )\) C. \(( \dfrac {5 \sqrt {2}}{2}, \dfrac {3}{2} )(- \dfrac {5 \sqrt {2}}{2}, \dfrac {3}{2} )\) D. \((0 , -3)(0 , 3)\)
