Which sharing option always requires recipients to log in with their Google account?

Invitation to edit" always requires recipients to log in with a Google account because it grants specific access permissions tied to a Google identity, ensuring secure collaboration and tracking of changes. Without a Google login, the system cannot verify the user's identity or assign editing privileges. "Shareable link" can be configured for public access without a login, or restricted to specific Google accounts. "PDF download" creates a static file that can be shared without any login requirements, as it's a snapshot of the report, not the live report itself. "Viewer’s credentials" is not a standard sharing option in Data Studio; reports are typically shared with the viewer's own Google account or publicly, not by sharing the report creator's credentials.