In a multi-source program, there is a fileA.c that contains variables and functions, and a fileB.c that contains the main function, as well as usage of some of the resources found in fileA.c. Explain: b) file_A.c also has a global variable called my_shared_variable, which can and should be accessible from other files, including fileB.c. How should my_shared_variable be declared in order to allow this functionality? Note for item ii): You also need to state in a comment where in fileA.c the variable declaration must be placed