Which role does OpenStack serve in SDN?

Refer to the exhibit.

You are trying to connect virtual machine A to virtual machine
B. Virtual machine A belongs to the security group WebServers. Virtual machine B belongs to the default security group.
Referring to the exhibit, which two actions would you perform on the default security group to allow access to virtual machine A? (Choose two.)

Prior to installing Contrail, which list of settings must be verified on all participating servers?

Which two statements are true regarding the Network Function Virtualization (NFS) framework? (Choose two.)

Your customer deletes a Contrail service instance VM directly from OpenStack.
In this scenario, which statement is correct?