使用以下哪个命令可以查看PE上是否有VPN用户路由信息
Adisplay ip routing-table
Bdisplay ip routing-table vpn-instance vpna
Cdisplay bgp vpnv4 all routing
Ddisplay bgp vpnv4 all routing vpn-instance vpna
Adisplay ip routing-table
Bdisplay ip routing-table vpn-instance vpna
Cdisplay bgp vpnv4 all routing
Ddisplay bgp vpnv4 all routing vpn-instance vpna