In a 3-Tier Data Center design without virtualization, which statement most closely defines the architecture of network services?

A.
Network services such as NAT and firewalls are typically distributed throughout the access layer.

B.
Network services such as routing and firewalls are typically deployed at the L2/L3 boundary.

C.
Network services such as NAT and firewalls are typically deployed in-line with the applications.

D.
Network QoS services such as classification and marking are performed by software in the compute nodes.