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关于MongoDB的update()和save()的说法下列描述中错误的是()

A.update()方法用于更新已存在的文档,如果更新的文档不存在的话,在默认情况下不进行插入

B.save()方法通用来保存一个不存在的文档

C.update()方法的query 参数表示update的查询条件,类似sql update查询内where后面的

D.update()方法的update参数表示将要更新的对象和一些更新的操作符

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第3题
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第5题
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