Question: In a merge - scan join _ _ _ _ . Question 3 5 options: neither of the two join attributes has to be in

In a merge-scan join ____.
Question 35 options:
neither of the two join attributes has to be in sorted order or has to have an index built over it
one of the two join attributes either has to be in sorted order or has to have an index built over it
both of the join attributes have to be in sorted order or have to have indexes built over them
the only requirement is that every row of one table is compared against every row of the other table looking for a match on the join attributes.

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