You work as a senior administrator at ABC.com. The ABC.com network consists of a single domain named ABC.com. All servers on the ABC.com network have Windows Server 2012 R2 installed， and all workstations have Windows 8 installed. You are running a training exercise for junior administrators.You are currently discussing the Always Offline Mode. Which of the following is TRUE with regards to the Always Offline Mode？（）

A. It allows for swifter access to cached files and redirected folders.
B. To enable Always Offline Mode，you have to satisfy the forest and domain functional-level requirements， as well as schema requirements.
C. It allows for lower bandwidth usage due to users are always working offline.
D. To enable Always Offline Mode， you must have workstations running Windows 7 or Windows Server 2008 R2.