Final answer:
Increased complexity is not an advantage of using functions.
Step-by-step explanation:
The correct answer is 4) Increased complexity. While the use of functions provides several advantages such as code reusability, modularity, and improved code readability, increased complexity is not one of them. Functions help break down a large program into smaller, manageable parts, making it easier to understand and maintain.
By separating different functionalities into functions, code becomes more organized and easier to debug. However, as a program grows and more functions are added, the overall complexity of the program may increase.