Please read the short case study and answer questions c1

Trans Move is a company providing logistical services for businesses to manage the supply chain. The services they provide include warehouse management, order fulfilment, distribution and shipping orders, and thus cover inbound flow, outbound flow, and return management. On top of transportation of freight, Trans Move also manages the distribution of freight for some clients. In some cases, Trans Move stores and manages a client's products in Trans Move's warehouses and decides when to ship the orders, as long as the order fulfilment meets the client's requirements.

question c1

The manager of Trans Move found that one of the key challenges is effectively managing its operations in the presence of variability. State two key sources of variability faced by Trans Move. For each source of variability, explain how the variability makes Trans Move's operations challenging and discuss ways to reduce the impact of variability.