Define a class Candidate in C++ with the following specification : [Delhi, 2015] Private Mumbers: A data members Rno (Registration Number) type long A data member Cname of type string A data members Agg_marks (Aggregate Marks) of type float A data members Grade of type char A member function setGrade() to find the grade as per the aggregate marks obtained by the student. Equivalent aggregate marks range and the respective grade as shown below. Aggregate Marks Grade > = 80 A Less than 80 and > = 65 B Less than 65 and > = 50 C Less than 50 D Public members: A constructor to assign default values to data members: Rno = 0, Cname N.A, Age_marks = 0.0 A function Getdata () to allow users to enter values for Rno. Cname, Agg_marks and call function setGrade () to find the grade. A function dispResult () to allow user to view the content of all the data members