write the XPath expressions for the following queries. a) Find titles of all classes. b) Find the classID of all classes with "Doug" as an instructor. c) Find titles for those classes with "yes" in attribute req of credits. d) Find titles for those classes with more than one instructor. 3.2 Convert the XML document classes.xml to its JSON format. classes.xml CS115 ComputerScience Adams Dykes Programming Concepts 3 CS205 ComputerScience Doug JavaScript 3 CS255 ComputerScience Chengfei Doug Dykes Java 3