An OR condition in an advanced filter requires at least two rows in the criteria range

Which of the following can hackers can use as part of a reconnaissance process to learn about active network addresses and active processes?

A. availability B. ICMP C. auto recovery D. presence

_____ lines, the most expensive type of digital line, are used primarily by large companies, phone companies, and service providers.

A. T-3 B. T-1 C. T-2 D. T-0