Referring to the exhibit, you connected your Brocade VDX device to an Ethernet switch
running PVST+. The interfaces are up but spanning tree is not functioning for VLAN 10.
VDX8770_3-131#sh run prot
protocol spanning-tree rpvst
!
VDX8770_3-131# sh run int vlan 10
interface Vlan 10
!
VDX8770_3-131#sh run int te 131/2/16
interface TenGigabitEthernet 131/2/16
fabric isl enable
fabric trunk enable
switchport
switchport mode trunk
switchport trunk allowed vlan add 10
switchport trunk tag native-vlan
no spanning-tree shutdown
no shutdown
What is the problem?

A.
The VDX is not configured for PVST+.

B.
The VDX is using the incorrect BPDU address.

C.
The VDX interface does not have spanning tree enabled.

D.
The VDX does not have spanning tree enabled on VLAN 10.