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【单选题】
设有2条路由21.1.193.0/24和21.1.194.0/24，如果进行路由汇聚，覆盖这2条路由的地址是_____。A.
21.1.200.0/22
B.
21.1.192.0/23
C.
21.1.192.0/21
D.
21.1.224.0/20
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