What acknowledgment mode includes only a simple application acknowledgment and is most useful in a point-to-point setting?

The acknowledgment mode that includes only a simple application acknowledgment is the original mode. This mode is designed for scenarios where communication occurs directly between two systems in a point-to-point manner, such as when data is transferred from one application to another without any intermediary steps. The simplicity of this acknowledgment allows the receiving application to confirm receipt of the message without the need for additional complexities or features that are present in other acknowledgment modes.

In contrast, enhanced mode tends to incorporate additional features and more complex acknowledgment processes, which may not be necessary in straightforward point-to-point communication. As such, the original mode's straightforwardness makes it particularly suitable for this type of interaction, emphasizing basic receipt confirmation without extra overhead.