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The manager at an engine manufacturer has asked a venture team to develop a more improved version of its most popular engine. Currently, the members of the venture team are brainstorming ways to improve the engine so that it better serves its target market. It decides to send customers surveys asking them what features they would like to see in a new engine. The venture team is most likely in the stage of product development.

a$.$ test marketing

b$.$ business analysis

C$.$ concept testing

d$.$ idea generation

e$.$ screening