Answer:
The correct answer is letter "D": Phased-In-Phased-Out Conversion.
Explanation:
Systems Development Life Cycle or SDLC is the process of creating and changing systems. models and methodologies that people use to develop software. In the Phased-In-Phased-Out Conversion stage, the new information system is split into several modules so they can be easily introduced and gradually the previous system used is left behind.