In the implementatio

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