Consider the following set of requirements for a healthcare system. Nittany Tiger Hospital is planning to build an information system. One of the major tasks of the project is to create a database system for the hospital. The hospital consists of multiple departments such as pediatrics and orthopedics $.$ Each department has a unique ID$.$ namephone number and multiple locations. A particular doctor manages a department $.$ Doctors, nurses and staff are employees of the hospital. An employee works for only one department $,$ and all employees belong to a department $.$ The organizational structure of the hospital is strictly hierarchical, so among the employees $,$ particular employee supervises other employees $.$ The database system stores employee's name $,$ social security number, job type $($ doctor, nurse or staff $),$ salary, an address $,$ office phone number, cell phone number, gender $,$ age and birth date. The system stores patient's name, patient ID social security number gender, birth date, blood type $($ ABO system$),$ and a home address. Each patient makes an appointment with a doctor or a nurse with a scheduled appointment time. Operations are performed by doctors. Multiple doctors and nurses work on each operation $.$ Each operation has a unique operation ID $,$ name, time and location. Of course, a doctor can perform multiple operations, and a patient can undergo multiple operations $.$ For emergency patient's acquaintance information $($ name, relationship $,$ and phone number $)$ is stored in the system. Storing multiple acquaintances is recommended $.($ All IDs are assumed to be unique $.)1.$ Answer the following questions clearly and precisely $.1\mathrm{.}1.$ Identify and list all the entity types $,$ relationship types, and corresponding attributes $.1\mathrm{.}2.$ List and describe the degree with respect to each relationship type $1\mathrm{.}3.$ List and explain all the structural constraints of all the relationship types. $2.$ Draw the ER $-$diagram for the scenario above $.$