For each problem below, create a clear ERD showing the relationships (with verb like HAS, MANAGES, etc.), the cardinalities (1:1, 1:M, M:N), and whether the relation is optional or required. For M:N relations, include an appropriate linking table to implement them. Entities should have necessary attributes shown, as can be discerned from the description.

3. Automata Inc. produces specialty vehicles by contract. The company operates several departments, each of which builds a particular vehicle, such as a limousine, a truck, a van, or an RV. Before a new vehicle is built the department places an order with the purchasing department to request specific components. Automata's purchasing department is interested in creating a database to keep track of orders and to accelerate the process of delivering materials. The order received by the purchasing department may contain several different items. An inventory is maintained so that the most frequently requested items are delivered almost immediately. When an order comes in, it is checked to determine whether the requested item is in inventory. If an item is not in inventory, it must be ordered from a supplier. Each item may have several suppliers. Given that functional description of the processes encountered at Automata 's purchasing department, create the ERD