Exam SPLK-1001 topic 1 question 164 discussion

B. Will return event where status field exists but value of that field is not 100 and all events where status field doesn't exist. Explanation: The query status != 100 checks for events where the status field exists and has a value different from 100. In addition to that, if the status field does not exist in an event, those events will also be included, because conditions that involve a field (like != 100) are not evaluated for events where that field is missing. Thus, the query captures both: Events where the status field exists but is not equal to 100. Events where the status field is absent entirely.

btool get this information

Also think D is correct