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多项选择题Your Web site processes book orders. One of the application methods contains the following code segment. XmlDocument doc = newXmlDocument（　）; doc.LoadXml(“10”+” Dictionary”); You need to remove the discount element from XmlDocument. Which two code segments can you use to achieve this goal? (Each correct answer presents a complete solution. （）

A、XmlNode root = doc.DocumentElement;root.RemoveChild(root.FirstChild);

B、XmlNode root = dec.DocumentElement;root.RemoveChild(root.SelectSingleNode(“discount”));

C、doc.RemoveChild(doc.FirstChild);

D、doc.DocumentElement.RemoveChild(doc.FirstChild);

  • A,B

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