Define a class Employee. Display the personal and salary details of five employees using single inheritance. (in C++)

(Student Inheritance Hierarchy) Draw an inheritance hierarchy for students at a universitysimilar to the hierarchy shown in Fig. 19.2. Use Student as the base class of the hierarchy, then include classes UndergraduateStudent and GraduateStudent that derive from Student. Continue toextend the hierarchy as deep (i.e., as many levels) as possible. For example, Freshman, Sophomore,Junior and Senior might derive from UndergraduateStudent, and DoctoralStudent and MastersStudent might derive from GraduateStudent. After drawing the hierarchy, discuss the relationships that exist between the classes. [Note: You do not need to write any code for this exercise.]

(JAVA) What is code refactoring?   Group of answer choices   A)None of the options are correct.   B) It is changing implementation of a method or constructor of a class, while leaving the declaration the same, allowing all users of that class to continue using the class without noticing the change.   C)It is abstracting a class so that common elements with another class are moved into the abstract class that both classes extend.   D) It is declaring all the methods that need to be supported in an interface. This guarantees that all classes implementing this interface will support those methods.

Using c++ (please add an example with the explanation) Chapter 4 - Inheritance What is an abstract class and how does it relate to creating objects?

(JAVA) The use case description for the View Exam Grades use case is described below. Determineclasses that are needed to implement the use case. Also, define each class's attributes andmethods. Represent class and its attributes and methods using the UML class notation.Use case name: View Exam Grades.Summary: The student looks at his/her exam grade of CS2365 OOP or CS3365 SoftwareEngineering.Actor: StudentPrecondition: None.Main sequence:1. The student enters the student ID and password into the system.2. The system checks if the student ID and password are valid.3. The system displays the course numbers (e.g., CS2365 and CS3365) if the ID andpassword are valid.4. The customer chooses only a course to view the grade.5. The system displays the course grade to the student.Alternative sequence:Step 3: If the student's ID and password are invalid, the system displays an error messageand asks to enter another ID and password into the system. If the ID and password arevalid, the system…

(Inheriting Interface vs. Inheriting Implementation) A derived class can inherit “interface” or “implementation” from a base class. How do inheritance hierarchies designed for inheriting interface differ from those designed for inheriting implementation?

Please solve d and e part.

Explain how composition contributes to reusability. Distinguish between IS-A and Has-A rules.

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