Which configuration issue would cause this problem?

When a wireless client roams between two different wireless controllers, a network connectivity outage is experienced for a period of time.
Which configuration issue would cause this problem?
A. Not all of the controllers in the mobility group are using the same mobility group name.
B. Not all of the controllers within the mobility group are using the same virtual interface IP address.
C. All of the controllers within the mobility group are using the same virtual interface IP address.
D. All of the controllers in the mobility group are using the same mobility group name.

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