What are the advantages of using functions? Select all that apply.

If you need to fix a bug or change something, it only needs to be changed in one place.

Functions can be collected into a library $($of codes$)$ and re$-$used in different programs.

It is harder to test code if it is neatly separated from the rest of the program.

Functions make it harder for someone else $($or you, a month later$)$ to read the code.

Breaking code into pieces helps you "divide and conquer" a problem.