A non-profit organization, NPO Global, uses Microsoft 365 Nonprofit Business Basic. The organization has 200 users and is growing. They need to: 1. Create a central repository for storing and sharing documents with external partners. 2. Allow multiple users to co-author documents in real time. 3. Provide a secure way for external partners to access only specific folders. 4. Maintain version history for all documents. Which Microsoft 365 app should the organization primarily use?