To prevent replay attacks, authentication protocols create a number that will be used only once. The number is called a .

In windows explorer, select the file, folder, or groups of files and folders you'd like to copy. you can select multiple files or folders in several ways: click the first file or folder you want to select, hold down the ctrl key, and then click each additional file or folder you want.

The best way she can do it is by doing the mentioned expirement but explaining it as a volcano eruption