What service does APPC provide?

APPC, or Advanced Program-to-Program Communication, offers peer-to-peer services specifically at the transport and session layers of the OSI model. This allows applications on different devices to communicate directly with each other, facilitating a more interactive and efficient exchange of data. By operating at these layers, APPC provides mechanisms for establishing sessions, managing the data flow, and maintaining the state of the communication between applications. Peer-to-peer communication is particularly beneficial in environments where multiple processes need to coordinate and share information seamlessly without the need for a central server to manage those interactions. In contrast, the other options do not accurately describe APPC's capabilities, as it does not focus solely on network layer services, authentication, or data transfer acceleration. Instead, it emphasizes robust communication between programs on different systems.