Read the given business scenario. Using Crow's Foot notation, draw the entities TEACHER and COURSE and CLASS. List the attributes underneath each entity. Specify whether they are mandatory or optional. Identify the UIDs.

$$We have several teachers at our school. A teacher can be assigned up to three classes per semester. If a teacher is on

sabbatical, he doesn$$t teach that semester. We keep a record of the teacher$$s first name, last name, address, phone number, and

email address.

Our school offers many courses $--$ such as Data Modeling, Introduction to SQL$,$ Trigonometry, Physics, and Biology. Each course

has a code. For example: Data Modeling would be DM$001,$ Trigonometry would be TR$004,$ etc. During each semester, a course

may be taught in several classes $--$ so there could be two classes of Physics, three classes of Biology, etc. Each class can be

taught by only one teacher. We assign a unique ID for each class, and we also keep track of the day it is taught, the time, and the

classroom.$$