2. (50 points) Design an ER diagram describing the following database. You are asked to adopt the Chen notation style (https://www.lucidchart.com/pages/er-diagrams?a 1) introduced in class (single or double lines and no arrow). Don't forget to underline the keys and put on the constraint for each relationship. Manufacturers have a name (unique), an address, and a phone number Products have a model number and a type (e.g., computer). Each product is made by one manufacturer, and different manufacturers may have different products with the same model number. However, we can find no manufacturer would have two products with the same model number. Customers are identified by their unique social security number. They have email addresses and physical addresses. Several customers may live at the same physical address, but we assume that no two customers have the same email address. An order has a unique order number and a date. An order is placed by one customer. For each order, there are one or more products ordered, and there is a quantity for each product on the order