Which option is the Cisco recommended maximum jitter value of voice traffic over the network?

50 ms exceeds the Cisco recommended maximum and would result in unacceptable voice quality due to insufficient jitter buffer compensation.

60 ms is well above the Cisco threshold and would cause severe audio distortion and dropped audio segments.

40 ms also exceeds the Cisco recommended 30 ms maximum jitter value for voice traffic.

Cisco recommends that jitter for voice traffic not exceed 30 ms one-way across the network. Jitter above this threshold causes noticeable audio degradation because the de-jitter buffer cannot compensate for the variation in packet arrival times, leading to choppy or distorted audio. This 30 ms value is part of Cisco's broader voice QoS design guide that also specifies less than 150 ms one-way delay and less than 1% packet loss.