Chick$-$fil$-$A has been experimenting with a new spicy chicken sandwich product, manipulating the price, and packaging at several stores over a $10-$week period. After analyzing the results of the experiments, the company realized it had to alter the recipe of the product itself because consumers reported that it was too spicy. During which new$-$product development stage is management likely to recognize the need to make changes to the marketing mix?

Group of answer choices

Business analysis

Technical development

Screening

Concept testing

Commercialization