Which two statements are true when row archival management is enabled?

The ROW ARCHIVAL VISIBILITY parameter controls which rows are returned (active vs. all), not whether the ORA_ARCHIVE_STATE column itself appears in output - column visibility is governed by explicit referencing in the SELECT list.

While ORA_ARCHIVE_STATE is updated manually, the phrase 'reference activity' is misleading - the column has no automatic activity-based trigger and must be set exclusively through explicit UPDATE statements.

The ROW ARCHIVAL VISIBILITY session parameter defaults to ACTIVE, which causes the database to automatically filter query results to only rows where ORA_ARCHIVE_STATE = '0', hiding archived rows from queries unless the parameter is explicitly changed to ALL.

ORA_ARCHIVE_STATE is a hidden system column not returned by SELECT *, but it becomes fully visible and is included in the result set when it is explicitly named in the SELECT list of a query.

Oracle Server does not automatically update ORA_ARCHIVE_STATE based on any internal activity - applications or DBAs must explicitly UPDATE the column to change a row's archival state.