What framework ensures customers that the products they are buying have been evaluated and that the vendor's claims have been verified?

Common criteria assurance

Explanation:

Common criteria assurance: - It guarantees that a computer safety product has been rigorous, standardly and repeatably defined, applied and evaluated in a way that preserves the target environment for use.

Pre-certification assessments are extensive and it includes the following levels:-

security target protection profile security functional requirements security assurance requirements evaluation assurance level