When performing an enterprise activation, the following error message appears. Some databases failed to synchronize. Address Book What are two possible causes of this error? (Choose two.) | Blackberry

A. Contact information required for synchronization is missing.
B. The address book is too large to synchronize.
C. Wireless PIM Sync is turned off.
D. There are invalid characters (such as #, %, $, and &) in the address book.
E. The BlackBerry Device Software installed on the BlackBerry device

Answer: A,D