You have 100 client Windows 8.1 computers. Users are NOT configured as local administrators.
You need to prevent the users from running applications that they downloaded from the Internet,

unless the applications are signed by a trusted publisher. What should you configure in the Security
settings from the Action Center?

A.
Virus protection

B.
User Account Control

C.
Windows SmartScreen settings

D.
Network Access Protection

Explanation:
http://windows.microsoft.com/en-ZA/internet-explorer/products/ie-9/features/smartscreen-filter
http://windows.microsoft.com/en-US/windows7/SmartScreen-Filter-frequently-asked-questionsIE9
http://technet.microsoft.com/en-us/network/bb545879.aspx
http://technet.microsoft.com/en-us/library/cc709691%28v=WS.10%29.aspx