Operational risks: 1- Affect the operation of a specific supply chain, and may arise at the level of a certain node or in the relationship between two or more nodes. 2- Affect the operation of the economy in general. 3- Disruptions to production due to mechanical, technical, or process failures; forecasting errors in input acquisition and in demand forecasting; failures in the power, communication, and transport infrastructures. 4- All of the above 5- 1&3 only