The correct answer is A. Bug.
A bug is an error, flaw, mistake, or fault in a computer program or system that causes it to produce an incorrect or unexpected result. Bugs can be caused by a variety of factors, including errors in the program’s code, incorrect input data, or hardware problems.
To debug a program is to find and fix the bugs in it. This can be a time-consuming and difficult process, but it is essential to ensure that the program is working correctly. There are a number of different techniques that can be used to debug a program, including using a debugger, stepping through the program line by line, and using print statements to output the values of variables.
A cursor is a small symbol on a computer screen that indicates the current position where text or other input can be entered. The cursor is usually a blinking line or block, but it can also be a different shape, such as an arrow or an I-beam.
An icon is a small image that represents a file, program, or other object on a computer. Icons are often used to make it easier to identify and select files and programs.
None of the other options are correct.