The figures below show an enterprise's Layer 2 networking architecture and information displayed when engineers check the device status after communication between departments fails. 
What are the possible causes of this communication failure?
A) The switches have different region names.
B) The switches have different instance-VLAN mapping configurations.
C) The switches have different revision levels.
D) The switches have different BPDU sending intervals.
Correct Answer:
Verified
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