I'm aware that organizations seek certification to ISO 9001:2015 in order to consistently provide products/services that meet THEIR customer and applicable requirements. What if an organization chooses to get certification only on their Internal Audit Office? Is it allowable? Can the IAO be certified under this scope of registration: "Provision of internal auditing services to various Offices of XYZ Corp"? (FYI: XYZ Corp. operates on a country-wide scale with various products and services).