正解:A
According to the GDPR, personal data shall be collected for specified, explicit and legitimate purposes and not further processed in a manner that is incompatible with those purposes1. This means that a business unit can only use personal information for a different purpose if it has obtained the consent of the data subject, or if it has a clear legal basis or obligation to do so2. Therefore, informed consent should be the first consideration when a business unit wants to use personal information for a purpose other than for which it was originally collected.
References = GDPR Article 5 (1) (b) and Article 6 (4)1, ICO Principle (b): Purpose limitation2