Having asked but deleted the question as it was a bit misunderstood. If Quality Control is the actual testing, what are the commonest true quality assurance activities? I have read that verification (reviews, inspections..) but it does not make much sense to me as it looks more like quality control as mentioned here:
DEPARTMENT OF HEALTH AND HUMAN SERVICES ENTERPRISE PERFORMANCE LIFE CYCLE FRAMEWORK Practices guide

Verification - “Are we building the product right?” Verification is a quality control technique that is used to evaluate the system or its components to determine whether or not the project’s products satisfy defined requirements. During verification, the project’s processes are reviewed and examined by members of the IV&V team with the goal of preventing omissions, spotting problems, and ensuring the product is being developed correctly.
Some Verification activities may include items such as: • Verification of requirement against defined specifications • Verification of design against defined specifications • Verification of product code against defined standards • Verification of terms, conditions, payment, etc., against contracts