Answer: c) Design
Explanation: System development life cycle(SDLC) consist of the designing phase in which the logical concept of building the system is implemented to make a physical design of the system. the previous phase documents and content is analyzed and them implemented to make the features, layout diagram etc of the system.
Other options are incorrect because planning phase provides the layout plan that is supposed to be implemented on the design and analysis is the analyzing of the complete system.thus, the correct option is option(c).