A new database needs to be developed. You are required to draw the related Entity Relationship Diagram (ERD) that includes the following information: 

(a) Employee (the company has several employees) 

(b) Department (each employee is assigned to one department) 

(c) Payroll (each employee receives his/her pay for the period) 

(d) Customer (employees sell products to customer) 

(e) Products (the company offers several products) 

Note that an employee can sell products to several customers and that every customer can be served by multiple employees. Include relationship types only if necessary and specify suitable primary keys for all elements. Include all primary keys and all foreign keys in the ERD.