设有下面4 条路由172.118.129.0/24,172.118.130.0/24,172.118.132.0/24和172.118.133.0/24,如果进行路由汇聚,能覆盖这4条路由的地址是()。A.172.1I8.128.0/21 B. I72.118.128.0/22C.172.118.130.0/22D. 172.118.132.01/20