Which one of the following, related to support, may be a valid nonconformity recorded against the requirements of ISO 9001:2015 during a quality management systems audit?

- A training matrix was not developed tor the quality control personnel for the current year

- Personnel on the shop floor were not aware of how they could influence the quality management system 7

- Quality procedures used in the production line were not reviewed every second year

- It could not be demonstrated that personnel conducting tests calibrated to ensure accurate monitoring.