Figure 3-13 shows the development of entity clusters for the Pine Valley Furniture E-R diagram. In Figure

Question:

Figure 3-13 shows the development of entity clusters for the Pine Valley Furniture E-R diagram. In Figure 3-13b, explain the following:
a. Why is the minimum cardinality next to the DOES BUSINESS IN associative entity coming from CUSTOMER zero?
b. What would be the attributes of ITEM (refer to Figure 2-22)?
c. What would be the attributes of MATERIAL (refer to Figure 2-22)?

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