What are two reasons to select OTV as the DCI solution to connect multisite topologies? (Choose two.)

What are two reasons to select OTV as the DCI solution to connect multisite topologies? (Choose two.)
A . It propagates hosts reachability without support of traffic flooding.
B . Layer 3 failures do not propagate beyond the OTV edge device.
C . It extends the spanning tree between data centers.
D . It is an open standard.
E . It constrains HSRP hello messages to each data center.

Answer: BC

Explanation:

Reference: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DCI3_OTV_Intro/DCI_1.html