Explanation
Schema Builder is a tool that creates a visual representation of objects and their relationships, and allows you to modify them.

Explanation
The Lightning App Builder is a tool that allows the associate to draft changes to the account record page, such as adding tabs, hiding components, and making fields conditionally visible, and preview them before publishing.

Explanation
The type of group that the associate should create to share records about a carpool program with users is a public group. A public group is a set of users that can be used to define sharing rules, queues, and other features that require a group of users. A public group can include individual users, other groups, roles, or territories. A public group can be used to share records with a specific group of users who are interested in the carpool program. A private group is a type of Chatter group that is not related to record sharing. A queue is a feature that allows users to manage leads, cases, and other objects as a team, but it is not suitable for sharing records about a carpool program.