Question $4(10$ points$)$ Sunshine Inc., a sunscreen company, is developing a piece of wearable technology that will alert users when they need to reapply sunscreen. The company is in the process of developing its first prototype that should reveal the intangible attributes the product possesses as perceived by the consumer. Sunshine Inc. is currently in the $\_\_\_\_$ stage. $$ idea development $$ business analysis $$ test marketing $$ commercialization $$ product development