can someone explain the cardinalities.

A constructive company always lets its customers make installment payments. When the company signs a contract with a customer is required to pay one percent of the total price as down payment. So far, no customer has paid in full at the time of purchase. Which set of cardinalities correctly shows this relationship?

(d) sales (1,N) - (1,1) cash receipts

1.3 A construction company builds custom homes only. So far, none of the customers have ordered two houses at one time. Which set of cardinalities correctly shows the relationship between inventory and sales?

(b) Inventory (1,1) - (1,1)Sales

1.4 A Small, local grocery store accepts cash, checks, and credit card payments from customers. The store has no other sources of income. Which set of cardinalities shows the relationship between sales and cash receipts?

(c)Sales(1,1) - (1,1)Cash receipts

1.5 A large company with several business lines has different types of bank accounts in several banks. Each business line has its own checking account for cash disbursements and cash receipts. Which set of cardinalities correctly shows the relationship between cash (bank accounts) and cash disbursements for the company (not for each business line)?

(b) cash(1,N) - (1,1) Cash disbursements

1.6 A traditional bookstore just started it's e-business using a website to take customer orders, while also maintaining its "brick -and-mortar" store. Which set of cardinalities correctly shows the relationship between sales and salespeople?

C. Sales (0,1) - (1, N) salespeople

1.7 A real estate company has many agents buying and selling residential properties and business sites. The company has very high turnover rates for these agents and sometimes agents will leave the company and then return several months later. Which set of cardinalities correctly shows the relationship between sales and agents?

C. Sales (1,1) - (0,N) Agents

1.8 A retail company would like to store information about current and potential vendors who supply inventories to the company. The company has a choice of vendors from which to purchase any single item of inventory. Which set of cardinalities correctly shows this relationship?

C. Inventory (1,N) - (0,N) Vendor