Given the following ER model:

which statement is not correct?

a. The ER model does not enforce that a supplier can only have purchase orders outstanding for products he/she can actually supply.

b. The ER model has both weak and existence-dependent entity types.

c. According to the ER model, a supplier cannot have more than one address.

d. According to the ER model, there can be suppliers that supply no products and have no purchase orders outstanding.

Transcribed Image Text:

supnr sup address sup status podate ponr sup name ON_ORDER supcity SUPPLIER (1...1) po_sup sup_po (0...n) (0...n) PURCHASE (0...n) ORDER SUPPLIES prod_sup sup_prod PO_LINE deliv period (0...n) PRODUCT (1...n) po_prod prod_po purchase _price available _quantity prod name quantity prodnr prod color