Final answer:
To reduce file size for efficient Internet transmission, use a file compression utility like JPEG compression, which discards unnecessary data without impacting image quality.
Step-by-step explanation:
To reduce file size so that files can be sent more efficiently across the Internet, one option is to use a file compression utility. File compression works by removing redundant or unnecessary data from a file, resulting in a smaller file size. One popular file compression method is JPEG compression, which discards colors that are not necessary, reducing the file size without significantly impacting the quality of an image.
Dividing the file in half and sending the two halves separately may not reduce the overall file size and can introduce other issues, such as the need to recombine the file at the receiving end. Increasing the mail server's attachment size limit may allow larger files to be sent, but it doesn't address the issue of reducing file size. Using smaller fonts in the files may make a small difference in file size, but it is unlikely to significantly impact the efficiency of sending files over the Internet.