)in order, the three-step process of using a file in a c++ program involves: 94) a. open the file, read/write/save data, close the file b. insert a disk, open a file, remove the disk c. create the file contents, close the file, name the file d. name the file, open the file, delete the file e. none of these

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Write a method named addall that could be placed inside the hashintset class. this method accepts another hashintset as a parameter and adds all elements from that set into the current set, if they are not already present. for example, if a set s1 contains [1, 2, 3] and another set s2 contains [1, 7, 3, 9], the call of s1.addall(s2); would change s1 to store [1, 2, 3, 7, 9] in some order. you are allowed to call methods on your set and/or the other set. do not modify the set passed in. this method should run in o(n) time where n is the number of elements in the parameter set passed in.