TherecordSetVarattribute of the<apex:page>tag allows a Visualforce page to handle multiple records, which is ideal for list buttons that display a page for bulk editing.
Why not other options?
A: Standard controllers can be extended, but usingrecordSetVaris the direct and best-supported method for this scenario.
B: There is no such concept as a "Custom List Controller" in Visualforce.
C:is not a valid Visualforce tag.
Visualforce Standard Controller with RecordSetVar
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