Question: Secondary name servers periodically query the primary to check whether the zone data has been updated. Regardless of how many resource records the zone data

Secondary name servers periodically query the primary to check whether the zone data has been updated. Regardless of how many resource records the zone data contains, the secondary name servers need to query the primary only one resource record to detect any changes on the zone data. Which resource record will they query? How will they use the requested information to detect changes?

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