What does the DRY principle say?

Don't Repeat Yourself: each piece of knowledge lives in one place (Correct option)
Do Refactor Yearly: review and clean the code every year
Delete Redundant Years: remove old versions of the code
Document Right away: write the docs with each commit

Don't Repeat Yourself: each piece of knowledge should live in one place

If the same logic is copied in five places, a bug fix or rule change must be made five times, and someone will forget one.

DRY says: put that logic in one function, class or constant and reuse it.

But do not merge code that only looks similar by accident; sometimes a little duplication is clearer than the wrong abstraction.

One rule, one place.