Which of the following is a correct statement about primary keys? Multiple Choice The data values of a primary key must be different (i.e., unique). A primary is always another table's foreign key. X A primary cannot be used in another table as a foreign key. Most tables in a database may not require primary keys. Which of the following is a BEST primary key for cash disbursement table? Multiple Choice Purchase order number Check number X Inventory receipt number Disbursement voucher number Which of the following could be a relationship table (i.e., to link two tables)? Multiple Choice Purchase order table Purchase line-item table Inventory receipt table X Disbursement table Which of the following is not a valid link between tables? Multiple Choice Linking Sales Table and Inventory Table Linking Purchases Table with Cash Disbursement Table X Linking Salespeople Table with Customer Table Linking Vendor Table with Customer Table