What does an executable file contain?

An executable file is specifically designed to contain a set of instructions that a computer can execute to perform a particular task. These files, when run, trigger a series of operations that may include starting a program, running scripts, or performing calculations.

The other options are not applicable because images for print output are typically graphic files, not executable files; data files created by users are often stored in formats that do not contain executable instructions; and backup data from a previous session serves a different purpose entirely, focusing on preserving information rather than executing commands. Therefore, the essence of an executable file lies in its ability to carry and execute computer instructions, making the second option the correct choice.