What is the MOST likely cause for you to investigate?

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You have discovered a common mode current on the metallic cable sheaths of your building riser cables.

What is the MOST likely cause for you to investigate?
A . Lack of cable protection
B . Two separate and distinct ground references
C . Improper secondary protection
D . Improper physical protection of cable
E . Improper placement and/or termination of cables

Answer: B