Your Service Provider does not support Link Fragmentation and Interleave, but upstream serialization delay on your broadband link is affecting voice quality. Which two mitigation strategies are viable?（）

A.Upgrade your residential broadband service to at least 768kbps uplink.

B.Switch your home router to use PPP encapsulation.

C.Use the ip tcp adjust-mss interface command.

D.Employ QoS techniques to drop large data packets.

E.Use traffic shaping to interrupt large data packets.