Redstone Inc. manufactures and markets computer games. Its latest game, Warrior Xero, is designed specifically for teenagers. The company recently implemented a free trial where they invited teenagers to their office to play the game. After the free trial, the company's market research executives conducted discussion sessions with the teenagers to gain insights into the product and whether any changes needed to be made. The research conducted by Redstone Inc. best exemplifies _____. Group of answer choices mathematical modeling observational research focus groups group experiments