South Carolina requires agency disclosure:

Option A is incorrect because waiting until closing to disclose agency relationships violates South Carolina's requirement. Disclosure must happen before services begin, not at transaction completion.

Option C is incorrect because South Carolina does not make agency disclosure optional. It is a mandatory requirement that must be provided, not just when requested by the client.

Option D is incorrect because South Carolina, like all states, requires agency disclosure. Never disclosing agency relationships would violate state regulations and professional standards.