The Acme company has determined that during its busiest hours， the average number of internal VoIP calls across the WAN link is four （4）. Since this is an average， the WAN link has been sized for six （6） calls with no call admission control. What will happen when a seventh call is attempted across the WAN link？ （）

A. the seventh call is routed via the PSTN
B. the call is denied and the original six （6） calls remain
C. the call is completed and the first call is dropped
D. the call is completed， but all calls have quality issues
E. the call is completed but the seventh call has quality issue