Final answer:
In most jurisdictions, Reina has full ownership of the tiny house. Keith would not automatically regain access after his release, and Reina is generally allowed to change the locks or install a security system.
Step-by-step explanation:
In most jurisdictions, the true statement would be 2) Reina has full ownership of the tiny house. Joint tenancy is a form of property ownership where each tenant has an equal and undivided interest in the property. However, if one of the joint tenants transfers their interest to another person, the joint tenancy is severed and converted into a tenancy in common. This means that Keith would no longer have a joint tenancy with Quincy and would no longer have a right to the property.
Regarding option 3), after Keith's release, he would not automatically regain access to the tiny house. If Keith had a legal interest in the property prior to his release, he might have to take legal steps to regain ownership or possession of the property.
Lastly, option 4) Reina is generally allowed to change the locks or install a security system as the sole owner of the tiny house.