Refer to the exhibit.

The switches shown in the exhibit form a TRILL region. The network administrator has enabled TRILL. What helps to ensure that Switch 2 sends
multicasts and broadcasts over both of its switch-to-switch links?

A.
Configure a switch to be the tree root bridge and allow the creation of multiple trees.

B.
Configure Switch 3 and Switch 4 with the same designated routing bridge (DRB) priority.

C.
Configure Switch 2 with multiple MSTP instances, which are mapped to TRILL access VLANs.

D.
Configure Switch 2 to enable TRILL Equal Cost Multi-Path (ECMP) globally.

Explanation:

https://en.wikipedia.org/wiki/Equal-cost_multi-path_routing