Final answer:
The four unities of possession, interest, time, and title are associated with joint tenancy, wherein all tenants have equal ownership and rights to the property.
Step-by-step explanation:
The four unities of possession, interest, time, and title are key principles associated with joint tenancy. These unities require that all tenants jointly own the property equally. Each tenant has an equal right to occupy the entire property (unity of possession), the tenants must have the same proportionate interest and duration of rights (unity of interest and unity of time), and they must acquire their interests through the same transaction (unity of title).
In contrast, severalty ownership pertains to when a property is owned by one individual or corporation exclusively. Community property refers to a form of ownership by spouses during marriage in which each owns an undivided one-half interest in the property. Tenants in common may share the property, but unlike joint tenancy, they are not required to do so with the four unities, especially the right of survivorship does not apply.