5.
如图,△ABC中,∠ABC=30°,BC=6,点D是BC边上一点,且BD=2,点P是线段AB上一动点,则PC+PD的最小值为( )
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| A. | 2$\sqrt{7}$ | B. | 2$\sqrt{5}$ | C. | 2$\sqrt{3}$ | D. | 3$\sqrt{3}$ |