B. Extend and modify the E-R data model by adding only the QACS's inventory system requirements described in the QACS Project details at the end of Chapter 4 to the data model from part A. Use the IE Crows Foot notation for your E-R diagrams. Create appropriate identifiers and attributes for each entity. Justify the decisions you make regarding minimum and maximum cardinality. *Note: This extension adds the ability to handle non-unique items. It also allows for the possibility of obtaining an identical item from multiple vendors