The choice of mitigation technologies should:
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Follow security best practices
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Depend on the number of sources researched
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Not depend on the technology of the application
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Address as few threat types as possible
Mitigation technology choices should follow established security best practices and frameworks rather than being ad hoc decisions based on the number of sources consulted. Best practices provide vetted patterns for secure design (e.g., OWASP Top 10, NIST guidelines, secure coding standards). Mitigation should directly address the application's technology stack (C is wrong), and should comprehensively address relevant threat types (D is wrong - you want to cover as many applicable threats as possible). The number of sources (B) is less important than their quality and alignment with standards.
Choosing mitigation technologies should follow established security best practices to ensure the chosen controls are proven, appropriate, and maintainable. It should not be based merely on how many sources were researched (a process metric, not a design criterion) or ignore the application's specific technology stack (mitigations are often technology-dependent, e.g., framework-specific protections). Effective mitigation should address as many relevant threat types as feasible, not as few as possible, so that option is backwards.