you have recently written the code shown below: Hashtable emailAddresses = new Hashtable （　）; emailAddresses.Add ("Mia", "mia@ Certkiller .com"); emailAddresses.Add ("Andy", "andy@ Certkiller .com"); emailAddresses.Add ("Kara", "kara@ Certkiller .com"); You need to ensure that these e-mail addresses are stored in the Email.dat file so that you can load them again when the user restarts the application. What should you do?（）

• A、
• B、
• C、
• D、