In order to reduce the file size of an image in word the user should use?

To reduce the file size of an image in Word, the user should select the image, go to the "Picture Format" tab, and click on "Compress Pictures." From there, they can choose to apply the compression to the selected image or all images in the document, as well as select options to reduce the resolution. Additionally, saving the document in a different format, like PDF, can help further decrease file size.