To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Defect Prevention - This option is incorrect because the STRIDE technique is not specifically used for defect prevention. It is a threat modeling technique used to identify and analyze potential threats and vulnerabilities in a system.
Option B) DAR - It is unclear what "DAR" refers to in the context of web application security. Without further information, we cannot determine if this option is correct or incorrect.
Option C) Design - This option is incorrect because while the STRIDE technique can be used during the design phase of web application security, it is not specifically limited to this phase. It can be used throughout the development lifecycle.
Option D) Threat Modelling - This option is correct because the STRIDE technique is commonly used in threat modeling. Threat modeling is a process of identifying and assessing potential threats and vulnerabilities in a system or application. The STRIDE technique is a mnemonic acronym that stands for Spoofing, Tampering, Repudiation, Information Disclosure, Denial of Service, and Elevation of Privilege. It helps in systematically identifying and analyzing these threats during the threat modeling process.
Therefore, the correct answer is D) Threat Modeling. This option is correct because the STRIDE technique is commonly used in threat modeling to identify and analyze potential threats and vulnerabilities in a web application.