Explanation/Reference:
Explanation:
A. By default, 64-bit versions of Windows Vista and later versions of Windows will load a kernel- mode driver only if the kernel can verify the driver signature. However, this default behavior can be disabled to facilitate early driver development and non-automated testing.

Incorrect:
Not B: specifies that Windows automatically restarts your computer when a failure occurs.
Not C: Developer would not be able to test the driver as needed.
Not D: Removes or repairs critical windows files, Developer would not be able to test the driver as needed and some file loss.
Reference: Installing Windows Server 2012.
http://technet.microsoft.com/en-us/library/jj134246.aspx
http://msdn.microsoft.com/en-us/library/windows/hardware/ff547565(v=vs.85).aspx