The protocol data unit (PDU) for the application layer in the Internet stack is:
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Answer: C
In the Internet (TCP/IP) protocol suite, each layer processes data in specific units known as Protocol Data Units (PDUs). The terminology used for PDUs at different layers is as follows:
- Application Layer: Message
- Transport Layer: Segment (for TCP) or Datagram (for UDP)
- Network Layer: Datagram (or Packet)
- Data Link Layer: Frame
- Physical Layer: Bits
Therefore, the protocol data unit for the application layer is a Message.
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