Which of the following is NOT a function of the Presentation Layer?

The Presentation Layer in the OSI model is primarily responsible for the translation, formatting, and encryption of data to ensure that it is readable by the application layer. Its functions include data encryption, character encoding, and data formatting.

Data encryption is crucial for securing data during transmission, making it unreadable to unauthorized users. Character encoding ensures that characters are properly represented so that systems can understand the data being sent. Data formatting relates to how data is presented or structured, enabling different systems to interpret it correctly.

Session management, on the other hand, is a function of the Session Layer in the OSI model. This layer is responsible for establishing, maintaining, and terminating communication sessions between applications. Therefore, session management does not fall under the responsibilities of the Presentation Layer, making it the correct answer in this context.