"Loopback method" includes the following four steps: 1. Loopback business channel sampling; 2. Draw a business path diagram; 3. Loopback section by section to locate the faulty site; 4. Preliminarily set as a single board problem. The correct order of the above four steps is?

"Loopback method" includes the following four steps: 1. Loopback business channel sampling; 2. Draw a business path diagram; 3. Loopback section by section to locate the faulty site; 4. Preliminarily set as a single board problem. The correct order of the above four steps is?
A . 1234
B . 3124
C . 2143
D . 2134

View Answer

Answer: B