You load an XmlDocument named doc with the following XML. You need to change the value for the genre attribute to NA for all book attributes. First, you add the following code segment to your class. XmlElement root = doc.DocumentElement; XmlNodelist nodes = root.SelectNodes(“books/book”); Which additional two code segments can you use to achieve this goal? （）

• A、foreach (XmlNode node in nodes){ node.Attributes[0].Value = “NA”;}
• B、foreach (XmlNode node in nodes){ node.Attributes[1].Value = “NA”;}
• C、foreach (XmlNode node in nodes){XmlNode genre = node.SelectSingleNode(“/genre”); genre.Value = “NA”;}
• D、foreach (XmlNode node in nodes){XmlNode genre = node.SelectSingleNode(“@genre”); genre.Value = “NA”;}
• E、foreach (XmlNode node in nodes){XmlNode genre = node.SelectSingleNode(“genre”); genre.Value = “NA”;}