What is the $90-90$ rule$$ in software projects?

Group of answer choices

A rule stating that $90\%$ of the project effort should be spent on planning.

A rule suggesting that $90\%$ of project time should be allocated to coding.

A rule describing how the first $90\%$ of the project consumes $90\%$ of the effort and time, leaving the last $10\%$ requiring another $90\%$ effort and time.

A rule indicating that $90\%$ of project problems can be solved with $90\%$ teamwork.