In $\Delta ABC$,$m \angle B = 90^{\circ}$ and $\overline{BM}$ is an altitude to the hypotenuse $\overline{AC}$. If $AM = 4$ and $CM = 5$,find $AB$ and $BM$.

  • A
    $AB = 6, BM = 2\sqrt{5}$
  • B
    $AB = 2\sqrt{5}, BM = 6$
  • C
    $AB = 3, BM = 4$
  • D
    $AB = 5, BM = 4$

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