Final answer:
There isn't a set maximum data transfer size for HTTP; it depends on server and client configurations. However, one million bytes are referred to as a megabyte (MB).
Step-by-step explanation:
The question 'What is the maximum amount of data that can be served across HTTP at one time?' does not have a specific answer among the options provided (A) 1 MB, (B) 10 MB, (C) 100 MB, or (D) 14-16 KB because HTTP itself doesn't inherently limit the size of data that can be transferred. Rather, the maximum data transfer size is often limited by the server configuration, the client's capabilities, or specific application settings.
To address the reference information given, the unit for one million bytes is a megabyte (MB). In terms of computer memory and storage space, a kilobyte (KB) equals 1,024 bytes, an MB equals 1,024 KB, a gigabyte (GB) equals 1,024 MB, and a terabyte (TB) equals 1,024 GB.