Create an ERD based on the Crow$$s Foot notation using the business rules below.

Indicate strong and weak relationships on the ERD as well as mandatory or

optional nature of a particular connectivity. Include action verbs connecting the

entities as well as any number of attributes that you believe will allow the model to

be successfully implemented $($e$.$g$.,$ codes, names, addresses, phones, descriptions,

prices, etc$).$ Indicate corresponding primary and foreign keys within the entities.

Please submit the final ERD in $.$pdf format by exporting it from Lucidchart.

$$ Each sales representative may write many invoices, but each invoice is written by a

single sales representative $($assume that there are sales representatives who have not

written any invoices yet$).$

$$ Each sales representative must have only one manager who is also a sales

representative. A manager manages many sales representatives $($assume that the

manager must have at least one subordinate to be a manager$).$

$$ An invoice is written for a single customer. However, each customer may generate

many invoices $($assume that customers are in the database even if they have not

generated any invoices yet$).$

$$ An invoice contains many detailed lines, each of which describes one product bought

by the customer $($note that you cannot have an invoice with no lines$).$

$$ The product information for the invoice lines is stored in the product entity. Each

product can be found in many lines, but each line must have only one product

$($assume that there are products, which have not been sold yet$).$

$$ A product is supplied by many vendors and each vendor may supply many products

$($assume that the system keeps all vendors including those who have not supplied

anything yet$).$