A Cisco ACI fabric has three different endpoints S1, S2, and S3. These endpoints must communicate with each other without contracts. These objects have been created in APIC: - Two EPGs named DNS_EPG a

While adding them to Database_EPG would also allow them to communicate without contracts, the option 'Add S1, S2, S3 under DNS_EPG' (B) achieves the same goal as per the problem statement.

In Cisco ACI, endpoints belonging to the same Endpoint Group (EPG) are implicitly allowed to communicate with each other without requiring explicit contracts. By adding S1, S2, and S3 to the DNS_EPG, they will all reside within the same EPG and thus can communicate freely.

This choice is textually identical to B, which is a correct action for allowing contract-less communication between the endpoints.

While adding them to Database_EPG would also allow them to communicate without contracts, the option 'Add S1, S2, S3 under DNS_EPG' (B) achieves the same goal as per the problem statement.