Which feature will you disable to eliminate the ability to enumerate this information on your Cisco routers?

Your company uses Cisco routers exclusively throughout the network. After securing the routers to the best of your knowledge, an outside security firm is brought in to assess the network security. Although they found very few issues, they were able to enumerate the model, OS version, and capabilities for all your Cisco routers with very little effort. Which feature will you disable to eliminate the ability to enumerate this information on your Cisco routers?

A.
Simple Network Management Protocol

B.
Broadcast System Protocol

C.
Cisco Discovery Protocol

D.
Border Gateway Protocol