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Using the Ipconfig tool is the appropriate choice for deleting entries in the Domain Name System (DNS) cache on a client computer. The specific command used is "ipconfig /flushdns." This command instructs the operating system to clear the DNS resolver cache, thereby removing any stored DNS entries that could be outdated or incorrect. Flushing the DNS cache can resolve issues related to DNS name resolution and ensure that the client fetches the most current DNS information from the configured DNS server.

The other tools listed serve different network-related functions. Tracert is used to trace the path packets take to reach a destination, helping to diagnose network routing issues. Ping is utilized to test the reachability of a host on a network and measure the round-trip time for messages sent to the target. Netstat provides information on active connections, listening ports, and network statistics, which is useful for monitoring network activity. None of these tools are designed to manipulate or clear the DNS cache specifically, making Ipconfig the correct choice for this function.