【单项选择题】
Refer to the exhibit. The serial link that connects the two offices has a bandwidth of 128 kbps.What could be done to set aside 64 kbps of bandwidth to transport VoIP traffic over the WAN link？（）<br /> <img src="https://img.ppkao.com/2018-07/zhanglijun/2018072414071453542.jpg" /><p> Refer to the exhibit. The serial link that connects the two offices has a bandwidth of 128 kbps.What could be done to set aside 64 kbps of bandwidth to transport VoIP traffic over the WAN link？（）<br /> <img src="https://img.ppkao.com/2018-07/zhanglijun/2018072414071453542.jpg" /></p>
A、A.apply the clock rate 64000 command on both serial interfaces connected to the WAN link
B、B.apply the bandwidth 64 command on both serial interfaces connected to the WAN link
C、C.apply the frame-relay voice-bandwidth 64000 command to enable the QoS Call Admission Control feature on the serial link
D、D.apply the max-conn 64 command on a perial peer basis on both sides of the serial link
E、E.apply the ip bandwidth-percent eigrp 1 64 command on both sides of the serial link
F、F.apply the auto-cost reference-bandwidth 64 command on both sides of the serial link
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