Exam 300-620 topic 1 question 13 discussion

Extending the EPG out of the ACI Fabric: An EPG can be extended out of ACI fabric by statically assigning port to an EPG. As soon as leaf receives the traffic and determines the end point information, it assigns the traffic to Proper EPG by matching the VLAN ID on port.

L2 External Network with ACI This topic will help you to understand how and what methods are used to extend the layer 2 network outside the ACI fabric. There are various methods extend the layer 2 domain beyond ACI fabric. Extending the EPG out of the ACI Fabric: An EPG can be extended out of ACI fabric by statically assigning port to an EPG. As soon as leaf receives the traffic and determines the end point information, it assigns the traffic to Proper EPG by matching the VLAN ID on port. Extending the Bridge Domain out of the ACI Fabric: It is also possible to extend the bridge domain by creating the layer 2 outside connection (External Bridge network). By doing so, it extend the bridge domain to the outside network.

I am really struggling trying to find why answer A is not correct? Because creating an external bridged network does extend an EPG to the outside of ACI Fabric.

There are three ways of extending the Layer 2 domain outside the ACI fabric: 1. Manually assign a port to a VLAN which in turn gets mapped into an EPG. This action extends the EPG beyond the ACI fabric. 2. Create a Layer 2 connection to the outside network beyond the ACI fabric. This action allows a contract between an inside EPG and an outside EPG. This action extends the bridge domain. 3. Create a remote VTEP. https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/5eU6DfQV/LTRCRT-2611.pdf

Isn't the answer is external bridge domain?

I think correct answer is D