Create the following structure to hold information of a student. typedef struct { char name[50]; int id; char dept[20]; double cgpa; } student; a) Write a function void saveByDept(char *fileName, char *deptName, student allStudents[], int size) that will save the information of all students who belong to the department with name pointed to by deptName into a text file. The name of the file is given as an input parameter, filename. b) Write another function to delete the students of the department with a CGPA greater than or equal to 3 from the file you have created in part (a).