The correct option is Board sub-filter.

Using Board sub-filter allows Priya to add a JQL clause that excludes issues resolved more than six weeks ago from the board display while leaving the board's main filter and agile reports unchanged. This approach applies automatically to the board view and does not modify issue data or reporting filters.

Quick filters are incorrect because they require users to turn them on manually and they do not automatically remove issues from the board in the background.

Hide completed issues older than setting is incorrect because that setting is not as flexible as a JQL sub-filter and it can affect broader board behavior rather than providing a precise, board-only exclusion based on resolution date.

Automation rule to transition or archive issues is incorrect because automations would change issue state or archive items and that alters reporting and increases operational overhead compared with a simple board-level filter.

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