问题：

[单选]

A standalone wireless AP solution is being installed into the campus infrastructure. The access points appear to boot correctly， however， wireless clients are not obtaining correct access. You verify that the local switch configuration connected to the access point appears as the following： 
interface ethernet 0/1 
switchport access vlan 10 
switchport mode access 
spanning-tree portfast 
mls qos trust dscp 
What is the most likely issue causing the problem？（）

A . QoS trust should not be configured on a port attached to a standalone AP.
B . QoS trust for switchport mode access should be defined as "cos".
C . switchport mode should be defined as "trunk" with respective QoS.
D . switchport access vlan should be defined as "1".