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Honestly, i wish the questions in all the IT exams are easy as questions here :)
I agree with Ahmed, centralization is the main purpose of any client/server environment. As both names imply, server is an entity to serve requests and client is an entity to ask requests. Computers in workgroups are independent entities with each has its own local privileges and policies.
You can use "Preferences" in group policy to disable USB drives.
http://blogs.technet.com/b/danstolts/archive/2009/01/21/disable-adding-usb-drive-and-memory-sticks-via-group-policy-and-group-policy-preferences.aspx
You make client server network to have a centeralized administration of your network devices.
Read following article for block mass storage/usb/flash drive
http://support.microsoft.com/kb/823732
