What are the eight phases of the software development lifecycle (SDLC)?

Planning, security analysis, requirement analysis, design, implementation, threat mitigation, testing, maintenance

Planning, requirements, design, implementation, testing, deployment, maintenance, end of life

Plan, gather requirements, identify attack surface, design, write code, perform code reviews, test, deploy

Gather requirements, prototype, perform threat modeling, write code, test, user acceptance testing, deploy, maintain