(A) Reduce the following E-R Models into Relational Models: (B) Consider the following relational algebra expressions, for each expression, explain in words what the expression does. a. attendance>=75( Student ) b. c. \( \Pi_{\text {Emp_id }}\left(\sigma_{\text {Dept_Id }}=5( ight. \) Employee )) Respective tables are as below: Student (Reg._No., Name, Attendance, Marks, Dept._Name) Employee (EName, Emp_id, Salary, Dept._Id)