T-Tails, Anhedral and the C-5

[luvmuhud]

Tech gurus and aerodynamicists:

I am having a spot of trouble finding an accurate answer to the following questions:

Why would a designer use a T-Tail? (In light of the negative stall characteristics of T-Tails)

What does a T-Tail do to stability, and why?

Why does the C-5 have a high wing?

Is the stability influence of the T-Tail the reason for the anhedral on the C-5?

Thanks in advance for your answers.