What does the error message "Scheduled refresh is disabled because at least one data source is missing credentials" typically indicate?
A) The scheduled refresh cannot proceed because the credentials for one or more data sources required for the refresh are not provided or are incorrect.
B) The data source is not available due to a network issue, preventing the scheduled refresh from starting.
C) The scheduled refresh is disabled due to an issue with the refresh schedule settings.
D) The data source has been removed from the system, making the scheduled refresh impossible.