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Stateless NAT64 is characterized by a one-to-one mapping between IPv6 addresses and IPv4 addresses. This method simplifies translation by using a predefined mapping, allowing for the seamless conversion of IPv6 packets to IPv4 packets without maintaining any session state. Each unique IPv4 address has a corresponding IPv6 address, making it efficient for scenarios where the mappings do not change frequently.

In contrast, stateful NAT64 involves maintaining session information, which allows for more complex and dynamic translations but does not operate on a strict one-to-one mapping principle. Dynamic NAT64 typically refers to a method where a pool of IPv4 addresses is used to service multiple IPv6 clients, which can lead to multiple IPv6 addresses being mapped to a single IPv4 address. The term "multiple NAT64" does not represent a standard NAT64 type and would not be used to refer to a mapping approach. Each of these other options emphasizes different translation mechanisms that do not fit the criteria of a one-to-one mapping like stateless NAT64 does.