单选题Which statement is true about Kompella-based and Martina-based VPNs？（）A Both use LDPB Both use BGPC Both require additional hardware.D Both use a two-label stack for forwarding.
题目
单选题
Which statement is true about Kompella-based and Martina-based VPNs？（）
A
Both use LDP
B
Both use BGP
C
Both require additional hardware.
D
Both use a two-label stack for forwarding.