Administration of Symantec ProxySG 6.7

What are two (2) methods by which the ProxySG can detect the type of a file that is downloaded? (Choose two.)

Which VPM layer can be most commonly used to control decrypting of SSL traffic by authenticated username? (Choose the best answer.)

How do policy checkpoints evaluate the installed policy on a ProxySG? (Choose the best answer.)

What needs to be enabled for the Explicit HTTP service to be able to hand off SSL traffic? (Choose the best answer.)

Which proxy service intercepts HTTPS traffic when browsers point directly to the ProxySG and Detect Protocol is enabled? (Choose the best answer.)