• Rich Media Sessions: Determines the number of non-Unified Communications calls allowed on the Expressway (or Expressway cluster) at any one time. See the Call Types and Licensing section for more information.
• Traversal Server: Enables the Expressway to work as a firewall traversal server.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X14-0/exwy_b_cisco-expressway-administrator-guide/exwy_m_managing-licensing.html
Room system and desktop system registration licenses: These licenses are required for all devices that register to Cisco Expressway-C. Devices that consume a registration license will not consume a Rich Media license when they are in a call with any other Cisco registered device, Cisco Infrastructure product (for example, Cisco Meeting Server), or calls in the Cisco Collaboration Cloud.
In the answer you have "Device Provisioning" not "Device Registration", so no this in NOT correct answer. The question asks what you need for B2B. No matter where the device is registered you need Traversal Server and RMS
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