問題文
An administrator has a maintenance window of about half an hour per server and wants the most thorough single-node validation that fits. The available diagnostic offers four numbered levels of increasing duration. What does the administrator need to know about how those levels relate to each other?
選択肢
- The numbering reflects only how strict the pass thresholds are, so every level takes about the same amount of time.
- Each level exercises a different and non-overlapping group of subsystems, so the administrator has to run several of them in sequence to reach the coverage that a single level might appear to promise on its own.
- The levels can only be selected by name, not by number, and the administrator has to learn the name of each one first.
- Each higher level includes everything the lower ones run, so choosing one level covers the shorter checks as well and they do not have to be run separately.