Which option accurately explains BEA Delaware GDP estimates?

• BEA state GDP estimates are fixed permanently at first publication, so preliminary values should not be treated as permanently fixed
• BEA state GDP estimates can be revised, so preliminary values should not be treated as permanently fixed
• BEA state GDP estimates are never revised, so preliminary values should not be treated as permanently fixed
• BEA state GDP estimates cannot change after preliminary release, so preliminary values should not be treated as permanently fixed