DreamHouse Realty is building a custom Lightning app to track its expanding solar water collection...

 AppExchange and Apex Code are two resources that can provide custom components for a Lightning app. AppExchange is a marketplace where developers can publish and sell their custom components or apps. Apex Code is a programming language that can be used to create custom components or logic for a Lightning app. Import Wizard and Visualforce are not resources for custom components, but tools for data import and web page development respectively.