You need to push configuration changes from staging to production.

When pushing configuration changes from a staging environment to a production environment in SAP Customer Data Cloud:

API Keys: Each environment (staging and production) has its own unique API keys. These keys are not shared between environments.

Site Settings Replication: Site settings are not automatically replicated between environments. You must manually replicate the configuration changes (e.g., policies, screen-sets, etc.) from staging to production.

The other options are incorrect:

A & B: API keys are always different between environments, and site settings are not automatically replicated.

C: Even if the API keys were the same (which they are not), site settings still need to be manually replicated.

SAP Customer Data Cloud References:

Environment Management.

Replicating Configuration Changes.