单选题In the implementation of VLSM techniques on a network using a single Class C IP address，which subnetmask is the most efficient for point-to-point serial links？（）A255.255.255.240B255.255.255.254C255.255.255.252D255.255.255.0E255.255.255.248
单选题
In the implementation of VLSM techniques on a network using a single Class C IP address，which subnetmask is the most efficient for point-to-point serial links？（）
A
255.255.255.240
B
255.255.255.254
C
255.255.255.252
D
255.255.255.0
E
255.255.255.248
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