When using WMM Call Admission Control， what are the default bandwidth values for video on802.11a/n（）？

A.Max RF bandwidth is 75 percent， reserved roaming bandwidth is 6 percent.

B.Max RF bandwidth is 50 percent， reserved roaming bandwidth is 10 percent.

C.Max RF bandwidth is 50 percent， reserved roaming bandwidth is 15 percent.

D.Max RF bandwidth is 0 percent， reserved roaming bandwidth is 0.