According to Knuth, the best general-purpose sort is ____.

When you ________ data, you organize data based on the values in one or more fields

A) form B) group C) key D) label

If host A is able to successfully ping router R1 but not router R2, which of the following is guaranteed?

A) Port security is not filtering frames sent between host A and R1. B) Port security is filtering frames sent by R2. C) R2 itself is down. D) STP has not placed the right ports in a forwarding state.