Gagan's response closely aligns with the benchmark response and demonstrates a solid understanding of the Software Development Life Cycle (SDLC) and handling requirement changes. He effectively describes the phases of SDLC, including requirement gathering, design, and development, and highlights the use of tools like Git for version control. His mention of adopting an agile approach to manage requirement changes shows adaptability and a proactive mindset. However, the response could have included more specific examples or challenges faced during the process to enhance depth.