Final answer:
The authorization duration for approved shops to work under their quality control program can vary, depending on the governing authority or industry guidelines. The correct answer would typically be found in the regulatory documents or by consulting the specific quality control program.
Step-by-step explanation:
The question pertains to the authorization duration for approved shops to perform work as described in their quality control program. Without specific reference to a regulatory body or standard, the answer could vary based on the agency or industry guideline in question. Typically, such authorizations are subject to regular reviews and renewals to ensure ongoing compliance with current standards. Therefore, the correct answer might depend on the specific context provided by the governing authority, regulatory documents, or the quality control program itself.