The Systems Development Life Cycle's Implementation phase is the most time-consuming and expensive step (SDLC).
The Operations and Maintenance Phase is the most time-consuming and expensive phase of the system's existence because it is during this time that the information system is most valuable to the organization.
Because coding and testing require an excessive amount of time and resources, which raises the cost of production, implementation is without a doubt the most expensive part of a development cycle.
To know more about development life cycle visit:-
https://brainly.com/question/14804328
#SPJ4