When the subnet is configured on a bridge domain, on which physical devices is the gateway IP address configured? 

Answer options:

A. all leaf switches and all spine nodes
B. only spine switches where the bridge domain of the tenant is present
C. only leaf switches where the bridge domain of the tenant is present
D. all border leaf nodes where the bridge domain of the tenant is present

C

Reference: http://www.netdesignarena.com/index.php/2016/06/16/aci-tenant-building-blocks-forwarding-logic/