Threat modelingis aproactiveapproach used toidentify, analyze, and mitigate potential threatsbefore they impact production systems. It is especially useful in early development stages to anticipate vulnerabilities and attack paths. * Option B (Penetration testing)is areactive measureperformed on deployed systems, rather than prior to production. * Option C (Bug bounty)programs incentivize external researchers but do not proactively model risks before deployment. * Option D (SDLC training)improves security awareness but does notactively assess risks. Thus,A (Threat modeling) is the best choice, as it enablesearly identification and mitigation of security risks.