Full Detailed in Depth Explanation:

Geography validation in Oracle HCM Cloud ensures addresses conform to country-specific formats (e.g., postal code rules). If users are entering incorrect formats despite correct configuration, the validation enforcement level needs adjustment.

Option A ("Set the geography validation level to Error instead of No Validation") is correct. Oracle allows configuration of geography validation levels in the "Manage Geographies" task: No Validation (no checks), Warning (alerts but allows saving), and Error (prevents saving invalid formats). If set to No Validation or Warning, users can bypass the country-specific format. Changing it to Error enforces compliance by rejecting incorrect entries, as detailed in the "Implementing Global Human Resources" guide.

Option B ("Educate users to use the country-specific address format only") is a workaround, not a system solution, and does not enforce compliance.

Option C ("Effective End Date for geography validation is end of time") is irrelevant, as end-dating applies to data validity, not validation enforcement.

Option D ("Create a new geography validation") is unnecessary if the existing configuration is correct; the issue lies in the enforcement level.