The Cisco Wireless LAN Controller (WLC) feature that allows a wireless device to perform a Layer 3 roam between two separate controllers without changing the client IP address is **A. mobility tunnel**.
When a client roams from one controller to another, a mobility tunnel is established between the controllers to ensure that the client's session and IP address remain unchanged. This feature is part of Cisco's mobility architecture, which facilitates seamless roaming and maintains continuous client connectivity across different subnets and controllers.
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