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如图,在△ABC中,AB的垂直平分线DE交BC于点E,交AB于点D, AB=4cm,AC=5cm,BC=6cm,则△ACE的周长为┅┅┅┅┅┅┅┅┅┅┅┅┅┅( )
A.9cm B.10cm C.11cm D.12cm