Out of band management. What is the best practice Cisco design?

A.
Data traffic should never pass or enter the management network

B.
In-band management as backup

C.
Enforce QoS

D.
Enable dynamic routing

Explanation:
https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Security/SAFE_RG/SAFE_rg/chap9.html#wp1054521
An OOB management network should be deployed using the following best practices:
•Provide network isolation
•Enforce access control
•Prevent data traffic from transiting the management network