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Final answer:Packet sniffers are software tools used to capture and analyze data transmitted over a network. They are not hardware devices but rather application programs that operate on computer systems connected to a network. They can be used on both wired and wireless networks. C) Packet sniffers capture and analyze data transmitted over a network.Explanation:Packet sniffers are software tools used to capture and analyze data transmitted over a network. They are not hardware devices (A is false) but rather application programs that operate on computer systems connected to a network (C is true). Packet sniffers work by intercepting and examining network traffic, allowing users to analyze the content and inspect the data being transmitted. They are commonly used for network troubleshooting, security analysis, and monitoring network performance.Packet sniffers can be used to capture data from both wired and wireless networks (D is false), although there may be some limitations and additional considerations when using them on wireless networks. Packet sniffers can be employed in both wired and wireless environments to diagnose network issues, identify potential security vulnerabilities, and optimize network performance....