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The technique to prevent the exploitation of XML external entity (XXE) vulnerabilities encompasses multiple strategies, making the most comprehensive approach the correct choice. Each individual method plays a significant role in enhancing security against XXE.

Input validation serves to ensure that the data being processed meets certain criteria before it is consumed by the application. This can mitigate the risk by filtering out potentially malicious data that could exploit XML parsers.

Using secure coding practices involves employing guidelines and methodologies that address security from the ground up. When developers follow secure coding practices, they can produce code that minimizes the risk of vulnerabilities, including XXE.

Disabling DTD (Document Type Definition) processing directly targets the heart of XXE vulnerabilities. DTDs are what make it possible for XML parsers to include external entities. By disabling this feature, an application can prevent any external entity references, effectively eliminating the XXE risk.

Integrating all these techniques provides a multifaceted defense strategy, making them collectively the most effective approach to protect against XXE vulnerabilities.