Documents written in MathML and CML are ____ documents.

Answer the following statements true (T) or false (F)

1. An XML file can contain several root elements. 2. XML files must be loaded into XElement objects before being accessed with LINQ. 3. The characters < and & cannot appear in the content of an element of an XML file. 4. The statement lstBox.Items.RemoveAt(lstBox.SelectedIndex) deletes the item currently highlighted in lstBox. 5. The statement lstBox.Items.RemoveAt(lstBox.SelectedIndex) deletes the item currently highlighted in lstBox.In a Simple combo box, the list is always visible.

Your network firewall currently allows only HTTP traffic to pass through. You need to allow FTP traffic to pass through the firewall. Which of the following should be allowed?[Choose all that apply].

UDP port 21 TCP port 20 TCP port 21 UDP port 20