How do you make external users visible in the metadata framework?

How do you make external users visible in the metadata framework?
A . Set the mdfSystemExternalUserVisibilty field to editable in manage business configuration
B. Add a business rule to ONB2DataCollectionUserConfig
C. Set the mdfSystemExternalUserVisibility field to Editable in Configure Object Definition
D. Enable rule SAP_ONB2DataCollectionCheck

Answer: C