The correct answer to this question is 7. OSI stands for Open Systems Interconnection, which is the model that computers use to communicate via a network.
The following are the 7 layers:
1. The physical layer which transfers raw bits.
2 . The data link layer, which defines how the date should be formatted.
3. The network layer decides the path of the data
4. The transport layer transports the data
5. The session layer ensures the connection is maintained, as well as being in control of sessions and ports.
6. The presentation layer makes sure that the data can be used
7. The application layer ensures that the applications on the computer can be connected to the network.
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