Answer:
a compression software such as WinRar
Step-by-step explanation:
The utility she used to do this would have been a compression software such as WinRar. This software compresses large files or various files into a single ZIP or RAR file. This compressed file is much smaller than the original files that it contains, which is accomplished through a compression algorithm. This can also be encrypted with a password so that only specific individuals with access can open the file. Once unzipped or extracted, the original files are obtained in its original size.