Voice quality is bad due to high delay and jitter on a link. Which two actions will improve the quality of voice calls？（）
- AIncrease the queue size of the voice class.
- BGuarantee bandwidth during congestion to the voice class with a bandwidth command.
- CIncrease the tx-ring of the egress interface.
- DImplement LLQ for the voice class.
- EDecrease the rx-ring of the egress interface.
- FDecrease the queue size of the voice class.