An engineering team has come to the stage in the engineering design process in which it is iterating to improve the solution . What is one thing they might be doing ? A. Identifying the limits on how the prototype can be used to solve the engineering problem

B. Identifying different sets of criteria and constrains to use for each possible solution

C. Choosing one solution to model out of many possible solutions the team has identified

D. Making improvements to the original prototype in order to perform more tests