A placeholder for a piece of information that can change.

• A. Output
• B. Run
• C. URL
• D. Variable

Answer: (D)

In programming, a placeholder for information that can change is a variable. A variable is a named container that stores a value, and that value can be updated as the program runs. For example, a variable called score might start at 0 and later become 1, 2, or any other number as the program processes input. This ability to hold data that can vary over time is exactly what makes it a variable.

Output, on the other hand, is what the program produces as results. Run refers to the act of executing a program. A URL is a web address, which is typically a fixed location, though it can be used to build dynamic links; it isn’t the general idea of a mutable storage location in code.