When an administrator wants to make an exact copy of the production metadata in a developer sandbox, the most direct and effective method is:

C. Schedule Sandbox refresh

Here's why this option is suitable:

Sandbox Refresh: Refreshing a sandbox involves copying the metadata (and optionally data, depending on the sandbox type) from a production environment into a sandbox. This ensures that the sandbox is updated with the latest metadata configurations, including customizations and settings from the production environment. Developer sandboxes can be refreshed once per day, which makes this a viable option for keeping the sandbox environment closely aligned with production.
The other options are not as effective for this purpose:

A. Create and Deploy changeset: Using a change set would involve manually selecting and transferring specific components from production to the sandbox. This method is not only labor-intensive but also not suitable for making an "exact" copy as it does not automatically include all components.
B. Use Developer Console: The Developer Console is primarily a tool for developing, debugging, and testing code in Salesforce. It does not provide functionality to copy metadata from production to a sandbox.
D. Schedule full weekly backup: While scheduling a full backup is important for data recovery purposes, it does not serve the purpose of copying metadata into a sandbox. Backups are typically used to restore data in the event of data loss and are not suitable for sandbox configuration.
Therefore, the best and most efficient option for copying all production metadata into a developer sandbox is to schedule a sandbox refresh (Option C). This ensures the sandbox environment mirrors the production setup exactly, providing a reliable platform for development and testing....

how you say it? aamusic :P

Answer is C