Answer A is correct. Cisco ACI is using descriptiv language via UI and API. Contracts can utilize Proxy ARP and PBR as techniques for traffic routing, but it isn't the way to configure.
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-743951.html#Howcontractswork
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