2. In the following exercise no n-ary relationships are allowed. Draw the E/R diagram for the following database description. You must use inheritance and include all the details, such as keys, weak entities (if any), etc. There are two types of patients admitted to a hospital. Out-patients and Resident-patients. Both have a responsible Physician assigned and have an Admit-date. Only Resident-patients are assigned a bed (which may be currently empty). Both types of patients are identified by a patient ID. Out-Patients have a Check-Back-Date when they are to return for further testing. and a Resident-patient has a Discharge-Date. Beds are assigned to hospital rooms, there are at most 2 beds in each room. There are two types of beds, ICU beds and regular beds. Beds do not have a serial number or an ID. Physicians have also SSN, name, address and phone number