Refer to the exhibit.
The WLC administrator sees that the controller to which a roaming client associates has Mobility Role Anchor configured under Clients > Detail.
Which type of roaming is supported?
A. indirect
B. Layer 3 intercontroller
C. intracontroller
D. Layer 2 intercontroller
Both controllers are on different subnets. Must be layer 3 roam
B is correct.
Layer 3 roaming is similar to Layer 2 roaming in that the controllers exchange mobility messages on the client roam. However, instead of moving the client database entry to the new controller, the original controller marks the client with an “Anchor” entry in its own client database. The database entry is copied to the new controller client database and marked with a “Foreign” entry in the new controller. The roam remains transparent to the wireless client, and the client maintains its original IP address.
Source:
https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/overview.html
My be correct B