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Web probes are designed to gather a variety of performance metrics that are crucial for assessing the user experience and the efficiency of web services. The correct choice lists the key metrics typically monitored by web probes: Page Fetch Time, DNS Time, Server Response Time, and Availability.

Page Fetch Time assesses how long it takes to retrieve the content of a web page, allowing administrators to gauge the performance end-users experience. DNS Time measures the duration it takes for the Domain Name System to resolve a domain name into an IP address, which is an essential step in web traffic before fetching any content. Server Response Time is the time taken by the server to fulfill a request after receiving it. Lastly, Availability checks whether the service is reachable and functioning as expected. Collectively, these metrics provide a comprehensive picture of the web performance and help in diagnosing issues, ensuring timely resolutions, and optimizing the user experience.

Other options do not provide a complete view of the web performance metrics monitored by probes. Monitoring network latency alone focuses on a singular aspect of network performance rather than a wide-ranging assessment. Server uptime is important, but by itself only offers limited insight into the usability and performance of web applications. Similarly, client bandwidth does not cover the broader picture of web interactions and responsiveness