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.