Consider the following ER diagram. Number Year SECTION Qtr Students Ssn attended Course_number Name STUDENT Class Course_name Grade (a) Write the DTD (Sections.dtd) corresponds to the hierarchy shown in the above design. (b) Consider your DTD and create a sample JSON (Sections.json) document containing information about a few sections, students and their grade. (c) Write a program to parse the JSON and display the information using any of your favorite programming language.