Refer to the exhibit， which shows a PPPoA diagram and partial SOHO77 configuration. Which command needs to be applied to the SOHO77 to complete the configuration？（）
Refer to the exhibit. MPLS has been configured on all routers in the domain. In order for R2 and R3 to forward frames between them with label headers, what additional configuration will be required on devices that are attached to the LAN segment?（）
