Which technology is an example of the need for a designer to clearly define features and desired performance when designing advanced WAN services with a service provider?
A. FHRP to remote branches
B. Layer 3 MPLS VPNs secure routing
C. Control protocols (for example Spanning Tree Protocol) for a Layer 3 MPLS service
D. Intrusion prevention, QoS, and stateful firewall support network wide
