Which WAN scenario might be appropriate for queuing solutions?

Which WAN scenario might be appropriate for queuing solutions?
A. A newly implemented WAN connection has yet to demonstrate sufficient WAN statistics for congestion-level tracking.
B. A WAN connection features consistent congestion problems, and data transfers often suffer.
C. A WAN connection is rarely congested, and data transfers never suffer.
D. A WAN connection features occasional periods of congestion, and data transfers have occasionally suffered as a result.

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