Michelle and Zach are in a group following the design thinking model to create a solution to provide additional care for foster youth. The team has conducted human-centered research to inform their ideas for a solution, and they have finished brainstorming ideas and have settled on one that they think could work. They now mock up their first design attempt to share with foster care organizations to gain feedback on their possible solution. Based on what you learned in the Module 4 lecture, which step is Michelle and Zach's team currently on as they try out and gain feedback on their design mockup