An automotive supplier maintains CAD workstations in widely separated plant locations， and these locations are interconnected by single 1.5Mb/second communication lines.  A consultant has been asked to provide a solution that will allow back-ups to be centralized in one location and improve data recovery times.  Which TWO questions should the consultant ask first to determine the best solution？（）

• A、In what format are the CAD documents？
• B、How much data needs to be backed up from each remote site？
• C、What are the current acceptable windows for back up and restore？
• D、Are the plants within line-of-sight to enable wireless communication？
• E、Can the communication lines cost-effectively be upgraded to a higher level of service？