Explanation:

In Microsoft Purview, eDiscovery (Standard) (formerly Core eDiscovery) provides case management, holds, searches, and export. Microsoft describes that eDiscovery (Standard) lets investigators "search across Microsoft 365 data sources and export the results," including options to export native files, email to PST, and CSV reports for further review. It uses the same Content search engine and supports selecting locations such as **Exchange Online mailboxes, Microsoft 365 Groups, Teams, SharePoint sites, OneDrive accounts, and Exchange public folders," enabling organization-wide discovery that includes public folders.
Integration for end-to-end legal review from Microsoft Purview Insider Risk Management is specifically aligned to eDiscovery (Premium) (formerly Advanced eDiscovery). Insider Risk cases provide actions like
"Send to eDiscovery (Premium)" to create a review set and apply advanced processing, analytics, and review workflows. Those advanced integrations (review sets, analytics, legal hold communications) are not features of eDiscovery (Standard). Therefore: exporting results (Yes), Insider Risk integration (No, as it targets eDiscovery Premium), and searching Exchange Online public folders (Yes) are the correct evaluations based on the Microsoft Security, Compliance, and Identity study materials for Purview eDiscovery capabilities.