Which of the following statements are true about the Rapid Application Development $($RAD$)$ and the waterfall methods of the system development life cycle $($SDLC$)?$

a$.$

Because the newer method is an improvement, it is the best choice for all current and future projects

b$.$

Between RAD and the waterfall method, RAD is the older method

c$.$

The waterfall method is consistent standard that always has the same five phases

d$.$

RAD will deliver a version of the system sooner than the waterfall method

e$.$

Both RAD and the waterfall method have an requirements$/$analysis phase