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The program, which is a test to tell computer and humans apart, when filling out a form on the Web is known as a(n) ________

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Which of the following are valid subnet IDs for network 172.168.0.0, assuming mask 255.255.252.0 is used throughout network 172.168.0.0?

A) 172.168.2.0 B) 172.168.4.0 C) 172.168.42.0 D) 172.168.108.0 E) 172.168.110.0