The full form of SDLC is System Development Life Cycle, Which tells the rules and processor which have to follow by any software developer. It gives the benefits to make the error-free software.
Another option is invalid because--
Option a tells that the SDLC is a method but it is a formal processor.
Option b tells that the SDLC is a framework but it is not any framework it is a guideline.
Option d tells that the collection of theorems that are used to change in software projects but it is only the model, not any theorems.
