关于IS-IS邻居关系说法不正确的是（ ）
AL2路由器可以L2路由器建立邻居 level-2 IS and level-2 IS can establish adjacency
BL1路由器可以与L1/L2路由器建立邻居关系 level-1 IS and level-1/2 IS can establish adjacency
CL1路由器可以与L2建立邻居关系 level-1 IS and level-2 IS can establish adjacency
DL2路由器可以与L1/L2路由器建立邻居关系 level-2 IS and level-1/2 IS can establish adjacency