C describes class-based differentiation of traffic. It can use various methods to achieve the expected results, such as low loss, low delay, low jitter etc. B is only talking about one aspect. Therefore C is a better option.
Don't think too much. the question is about QoS which can prioritize voice traffic over any other traffics. Please see the following article: https://www.nextiva.com/blog/voip-qos.html
Don't think too much. the question is about QoS which can prioritize voice traffic over any other traffics. Please see the following article: https://www.nextiva.com/blog/voip-qos.html
A Prioritization Strategy for Data, Voice and Video:
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4. Put voice in a separate queue from video so that the policing function applies separately to each.
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Source: CCNA 200-301 Official Cert Guide, Volume 2 (pg. 245)
I would go with B, as RoguePotatoe stated, voice traffic can only function with a 1% packet loss or less, so it makes sense to avoid packet loss. Besides that, since video and voice traffic are both traffic types that can't afford delays or packet loss, I don't see how differentiating them would help regarding voice traffic.
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