When you choose to read your email using an email client, your email client interacts with the OSI (Open Systems Interconnection) model at the application layer.
C. application
The application layer of the OSI model is responsible for providing services and protocols that allow user applications to access network resources. In the case of email, the email client application communicates with email servers using protocols such as POP3 (Post Office Protocol version 3) or IMAP (Internet Message Access Protocol) at the application layer.
The application layer is the highest layer in the OSI model and is responsible for user interaction, file transfer, email services, web browsing, and other network applications.
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