In an adaptive or change - driven project life cycle: a. all planning precedes all executing. b. the product is well understood. c. the waterfall approach is commonly used. d. early results lead into planning later work.

Early results lead to planning later work.  

Explanation:

The project life cycle contains every phase of life that goes under your life project cycle. Some project has a different phase of the life cycle. The project life cycle is defined as the series of the phases that the project passes through the starting to the end of the cycle. It looks like that it is so simple.  

The life cycle approaches;

answer; use multiple stimuli;

answer; /// you data to develop general ideas or theories;