An engineer must allow multiple external networks to communicate with internal ACI subnets. Which action should the engineer take to assign the prefix to the class ID of the external Endpoint Group?

Refer to the exhibit.
Which two components should be configured as route reflectors in the ACI fabric? (Choose two.)
Refer to the exhibit.
Which two objects are created as a result of the configuration? (Choose two.)
An engineer is creating a configuration import policy that must terminate if the imported configuration is incompatible with the existing system. Which import mode achieves this result?