The correct answer is C because the SYSTEM$ALLOWLIST function returns the fully qualified URL and port information for Snowsight, which is essential for configuring proxy settings or firewall rules to secure access. This is explicitly documented in Snowflake's official documentation for accessing Snowsight through a proxy or firewall, and the community discussion shows 100$GET_TAG retrieves tag values, SYSTEM$GET_PRIVATELINK returns PrivateLink endpoints (not proxy info), and SYSTEM$AUTHORIZE_PRIVATELINK authorizes PrivateLink access rather than providing proxy configuration details.