Refer to the exhibit.

Model A is the recommended design for routing between Building Distribution switches and Campus Core switches. Which two statements describe the reasons? (Choose two)

A.
Model A uses timer-based non-deterministic convergence.

B.
Mode A uses timer-based, providing fast convergence to the remaining path.

C.
In Model A, a link or box failure does not require routing protocol convergence.

D.
In Model A, the Layer 3 redundant equal cost links support fast convergence.

Explanation:
Due to redundant links in place the routing protocols can select multiple equal cost paths and installs them as soon as one of the links goes down, such topology also can support load-balancing.
Link:
http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/HA_campus_DG/hacampusdg.ht ml