Which two key components are related to one firewall per ISP design option for e-commerce?
(Choose two.)
A.
It is a common approach to single-homing.
B.
This approach is commonly used in large sites.
C.
Any failure on an edge router results in a loss of session.
D.
It has one NAT to two ISP-assigned blocks.
E.
It is difficult to set up and administer.