To deploy a digital experience for emergency response using Public Sector Solutions (PSS), several core configurations are required. First, the Emergency Response Management (ERM) for PSS Managed Package must be installed, as it contains the specific components, objects, and business logic for the emergency response use case. Second, Person Accounts must be enabled. PSS is built on a constituent-centric data model where Person Accounts are used to represent individual citizens, which is essential for managing requests and services. Third, Web-to-Case must be enabled to allow the public-facing digital experience forms to capture service and program requests from constituents and businesses and create Case records in Salesforce, which is a fundamental part of the solution's intake process.

C. Enable Email-to-Case: While a valid channel for case creation, it is not a direct prerequisite for configuring the PSS digital experience components, which primarily use web forms.

E. Install the ERM for PSS Unmanaged Package: Salesforce distributes the official ERM solution as a managed package to ensure support and upgradeability. An unmanaged package is incorrect.

1. Salesforce Help, Public Sector Solutions, "Install Emergency Response Management": This document outlines the installation process, stating, "Install the Emergency Response Management for Public Sector Solutions managed package from the Public Sector Solutions Installer." This directly supports option A.

2. Salesforce Help, Public Sector Solutions, "Prerequisites for Installing Public Sector Solutions": This guide explicitly lists enabling Person Accounts as a critical prerequisite. It states, "Before you install Public Sector Solutions, enable Person Accounts in your org." This supports option B.

3. Salesforce Help, Public Sector Solutions, "Set Up Emergency Response Management": In the post-installation steps, this guide details configuring the "Request for Assistance" functionality, which relies on web-based case submission. It instructs the administrator to, "Set up Web-to-Case to allow constituents to submit cases from your Experience Cloud site." This supports option D.