Shirley analyzed her company’s product line of refrigerator magnet products. she then deleted a few tourist magnets that had lost their market growth and added in a grumpy cat magnet. she discovered the emoji magnet group needed more market penetration, so she designed a campaign, looked at the total line statistics, and fit and identified a few synergies for new products to address (like adding emoji magnets with a clip to hold papers on the fridge). shirley is using which big-picture product management marketing approach to adjust the company’s magnet line?