19.(4 pts) Place the following statements in the proper order for correctly using file stream variables in a program. Place the numbers 1 through 4 on the line provided with 1 being the first step Include the header file fstream Associate a file on the hard drive with a file stream variable using the open function Declare an identifier to be an input file stream or output file stream variable Use the file stream variable in a statement to write to a file or read from a file