The key concept in the question is the word "potential", which is (unfortunately) overloaded in the discussion.

The question is trying to ask: "When performing a duplicate case search, the system uses which of the following to identify a set of possible matching cases for further evaluation?"

When the system evaluates a case as  a "match", it first starts with the must-match conditions. These conditions must be satisfied in order for a case to be considered a potential duplicate. Using the example from the lesson this means that a case will only be flagged if:

• Its value for .BugArea matches the value for the current case.
• Its status does not contain the word "Resolved".
• Its value for .Description matches the value for the current case.

If these conditions are not met, then the case is not considered a potential duplicate, and the system excludes the case from the remainder of the matching process.

If the must-match conditions are met, then the weighted conditions become a factor. Each condition is assigned a score (Weight). If the case matches or exceeds the threshold score (Sum of the weights), then the case is considered a duplicate. Again, going back to the lesson, any two of the weighted conditions must be satisfied to consider the cases a match:

• The severity values match.
• The priority values match.
• The type values match.

So: to be considered a potential match, the "Must Match Conditions" must be satisfied. From there, the case is considered to be a match only if enough of the weighted conditions are true that the threshhold value is met or exceeded. If the weighted conditions do not match sufficiently, then the case is not considered to be a duplicate, and is not listed in the UI.