The network is displayed in the diagram below： You use the following information for switch SWA： Port Mode Encapsulation Status Native VLAN fa0/1 desirable n-802.1q trunking 5 Port VLANs is allowed on trunk fa0/ 1 1-100， 102-1005 Port VLANs is owned and active in management domain fa0/1 1-6. 8-100， 102-115， 197-999， 1002-1005 Port VLANs in spanning tree forwarding state and not pruned fa0/1 1-6， 8-100， 102-105， 108-999， 1002-1005 SW users in VLAN 107 complain that they are unable to gain access to the resources through theSW1 router. What is the cause of this problem？（）

A. VLAN 107 is not configured on the trunk
B. VLAN 107 does not exist on switch SWA
C. VTP is pruning VLAN 107
D. Spanning tree is not enabled on VLAN 107
E. None of the other alternatives apply