The GDPR refers to the principles of proportionality and subsidiarity.

Personal data can only be processed in accordance with the purpose specification. Incorrect. This is one of the legal limitations.

Personal data cannot be reused without explicit and informed consent. Incorrect. This is one of the legal limitations.

Personal data may only be processed when there are no other means to achieve the purposes. Correct. This is the definition of subsidiarity. (Literature: A, Chapter 3; GDPR Article 35(7))

Personal data must be adequate, relevant and not excessive in relation to the purposes. Incorrect. This is the definition of proportionality.