You have a very few Cisco 7920 wireless IP phones on your network， but lots of wireless laptops.You want to increase the bandwidth available for the laptops by decreasing the bandwidth reserved for the Cisco 7920 phones. What is the lowest percentage of voice-allocated bandwidthyou can select on the WLAN controller？（）

• A、25 percent
• B、40 percent
• C、55 percent
• D、75 percent