Which statement is true about WANs?

Which statement is true about WANs?

A.
Switches or concentrators often relay information through the WAN.

B.
WANs typically encompass broad geographic areas.

C.
In general, WAN technologies function at the middle three layers of the Open System Interconnection (OSI) model.

D.
Users of WANs do not typically own all transmission facilities.

Explanation:

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