A company has a Frame Relay WAN with one central - site router and 100 branch office routers. A partial mesh of PVCs exists: one PVC between the central site and each of the 100 branch routers. Which of the following could be true about the number of EIGRP neighbor ships?（）

• A、A partial mesh totaling 100: one between the central - site router and each of the 100 branches.
• B、A full mesh  -  (101 * 100) / 2 = 5050 - One neighborship between each pair of routers.
• C、101 - One between each router (including the central site) a nd its nearby PE router.
• D、None of the answers is correct.