What are two risks when using a source-based RTBH solution? (Choose TWO)

Your company's automation team is testing a controller-based solution for dynamic LSP management They do not want the topology acquisition process to allow the controller to become a transit node of the core network's.
Which solution would fulfill the requirements?

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Referring to the network design shown in the exhibit, you must ensure that VPN data between Site1 and Site2 will be earned over a single end-to-end LSP.
How would you advertise PE1's loopback address to accomplish this task?

You are asked to design a WAN for a large enterprise. Each site must have multiple connections for redundancy. MPLS is not available at every site but it is preferred where available.
Which topology satisfies these design requirements?

Your customer requires virtual machine mobility between two data centers, and they are pursuing a managed service.
Which solution would satisfy the customer's requirement?