VoIP clients can be impacted by jitter. Which of these statements best describes jitter?

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VoIP clients can be impacted by jitter. Which of these statements best describes jitter?

A. Jitter occurs because the receiver buffer is smaller than the sender buffer, thus packets are dropped and voice quality becomes worse.
B. Jitter is defined as variation in the delay of received packets.
C. Jitter can be reduced by designing cells that use only the 802.11a frequency band.
D. A best practice to avoid jitter is to ensure that the end-to-end round-trip time does not exceed 150 ms.