3.点O是矩形ABCD内任意一点,点O到点A、B、C的距离分别为a、b、c,那么点O到点D的距离为( )
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| A. | $\sqrt{{a}^{2}+{b}^{2}+{c}^{2}}$ | B. | $\sqrt{{a}^{2}-{b}^{2}-{c}^{2}}$ | C. | $\sqrt{{a}^{2}-{b}^{2}+{c}^{2}}$ | D. | $\sqrt{-{c}^{2}+{b}^{2}+{a}^{2}}$ |