Final answer:
The last phase of the systems development life cycle (SDLC) is implementation, follow-up, and maintenance.
Step-by-step explanation:
The four phases of the systems development life cycle (SDLC) end with the phase of Implementation, follow-up, and maintenance (c). This phase involves putting the design into action, monitoring its performance, and making any necessary adjustments or improvements to ensure the system operates effectively. It also includes ongoing maintenance and support to address any issues or changes that arise after implementation.