Which option provides software modularity in Cisco NX-OS software in the data center design?

Which option provides software modularity in Cisco NX-OS software in the data center design?
A. The ip routing command enables all of the features in the Cisco NX-OS.
B. All of the features are enabled by default in the Cisco NX-OS.
C. Individual features must be manually enabled to start the process.
D. The Cisco NX-OS has a management VRF that is enabled by default.