Which of the Following Are Drawbacks for Publicly Publishing Your

Multiple Choice

Which of the following are drawbacks for publicly publishing your application through e-mail? (Choose three)

A) The user must enable installation from "Unknown Source" on the Android device.
B) The application only reaches a selected set of users that are specified in the email by the developer prior to sending an email.
C) Any updated version of the application should be re-attached and sent to the users. There is no automatic updating.
D) It is a quick way to send the application to a limited number of users.