Create an ERD based on following requirements for a customer product database system: Each salesman can write many invoice but each invoice can only be written by one salesman. The database system needs to capture salesman number, their last name, first name, and email. The system also need to capture invoice date and subtotal for an invoice An invoice is only given to a single customer but each customer may have many invoices. The database system needs to capture customer number, last name, first name, and email. An invoice can have many order lines. Each order line describe one product purchased by a customer. Product has information such as product coder, description, and quality in inventory.