The AI agrees with the suggested answer of BD.
Reasoning:
The question asks for the two parameters that must be configured in the `config neighbor range` for spokes in the ADVPN network. Based on the provided exhibit and the understanding of ADVPN and BGP configurations, the following parameters are essential:
* **B. `set neighbor-group advpn`**: This command assigns the neighbors within the defined range to a specific neighbor group named "advpn". This is crucial for applying policies and configurations uniformly to all the spoke routers in the ADVPN setup, simplifying management and ensuring consistency.
* **D. `set prefix 172.16.1.0 255.255.255.0`**: This defines the IP address range for the neighbors that will be dynamically discovered, as spokes connect to the hub. It ensures that only neighbors within this specific IP range are considered as valid BGP peers.

Reasons for not choosing other answers:

**A. `set max-neighbor-num 2`**: While limiting the number of neighbors might be a consideration in some scenarios, it's not a mandatory parameter for basic ADVPN spoke configuration. The core functionality of dynamic neighbor discovery isn't directly tied to this setting.
**C. `set route-reflector-client enable`**: Route reflection is typically configured on the hub router in an ADVPN setup, not on the spokes. Spokes usually don't act as route reflectors themselves, therefore, it isn't configured on the spoke's BGP configuration.

Therefore, configuring the neighbor group and the prefix range are fundamental for establishing BGP peering with dynamically connecting spokes in the ADVPN environment.