在三角形 ABC 中， AB=4 ， AC=6 ，BC=8 ，D 为 BC 中点，则 AD= （）
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/1223/16087080480_55bbs.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/1223/16087080481_55bbs.png" />
C.3
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/1223/16087080483_55bbs.png" />
E.[img src="https://img.haodaxue.net/uploadimg/ico/2020/1223/16087080484_55bbs.png" />
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正确答案： B 答案分析：无
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