Create an abstract student class for parker university. the class contains fields for student id number, last name, and annual tuition. include a constructor that requires parameters for the id number and name. include get and set methods for each field; the settuition() method is abstract. create three student subclasses named undergraduatestudent, graduatestudent, and studentatlarge, each with a unique settuition() method. tuition for an undergraduatestudent is $4,000 per semester, tuition for a graduatestudent is $6,000 per semester, and tuition for a studentatlarge is $2,000 per semester.

<?php

abstract class Student {

 public $Id; // field for student ID  Number

 public $Lastname; // field for student last name

 public $Tuition; // field for annual tuition

 public function __construct( $id, $lastname) { // constructor property to initialise id number and lastname

 $this->Id = $id; // variable initialisation

 $this->Lastname = $lastname;

 }

 // set Id number

 public function setId($id) {

 return $this->Id = $id;

 }

 // get id number

 public function getId() {

 return $this->Id;

 }

   // set lastname

 public function setLastname($lastname) {

 return $this->Lastname = $lastname;

 }

 // get lastname

 public function getLastname() {

 return $this->Lastname;

 }

   //the setTuition() method is abstract

 abstract public function setTuition($amount);

 // get Tuition fee

 public function getTuition(){

 return $this->Tuition;

 }

}

 // UndergraduateStudent is a subclass that inherits the properties of class Student

class UndergraduateStudent extends Student {

 public function setTuition($amount) {

 return $this->Tuition = $amount;

 }

}

class GraduateStudent extends Student {

 public function setTuition($amount) {

 return $this->Tuition = $amount;

 }

}

class StudentAtLarge extends Student{

 public function setTuition($amount) {

 return $this->Tuition = $amount;

 }

}

   // create an instance of the class

$Undergraduate = new UndergraduateStudent(1,"Anyadike");

   // call all required methods

   echo '<span> id: </span>'.$Undergraduate->getId();

   echo '<span> name:</span>'.$Undergraduate->getLastname();

   echo "<span> Tution:</span>".$Undergraduate->setTuition("$4000");

 echo "<br>";

$GraduateStudent = new GraduateStudent(2,"Okonkwo");

   echo '<span> id: </span>'.$GraduateStudent->getId();

   echo '<span> name:</span>'.$GraduateStudent->getLastname();

   echo "<span> Tution:</span>".$GraduateStudent->setTuition("$6000");

 echo "<br>";

$StudentAtLarge = new StudentAtLarge(3,"Ojukwu");

 echo '<span> id: </span>'.$StudentAtLarge->getId();

   echo '<span> name:</span>'.$StudentAtLarge->getLastname();

   echo "<span> Tution:</span>".$StudentAtLarge->setTuition("$2000");

?>

Explanation:

explanations are detailed in the comment (//)

answer is c. complication