Drag and drop the OSPF area types from the left onto the correct statements on the right

Refer to the exhibit:
A network operator working for service provider with an employee id 3715 15:021 applied this configuration to a router.
Which additional step should the engineer use to enable LDP?
Refer to the exhibit:
Which command is used to complete this configuration for QoS class-based marking?
Which fact must a network engineer consider when planning to deploy RSVP-TE FRR?