What must be completed to legally purchase a firearm from a licensed dealer in Louisiana?

To legally purchase a firearm from a licensed dealer in Louisiana, a background check must be completed. This is a standard procedure required by federal law to ensure that the buyer does not have a criminal record or history of mental illness that would prohibit them from owning a firearm. Options A, C, and D are incorrect because they are not required by law to purchase a firearm in Louisiana. While it may be advisable to have firearms training and/or an open dialogue with local law enforcement, these are not mandatory requirements for purchasing a firearm from a licensed dealer. Additionally, a physical fitness test would not be relevant as it does not pertain to the individual's ability to safely handle a firearm. Therefore, the only necessary step to legally purchase a firearm in Louisiana is to complete a background check.