In the context of software development, which statement best describes the concept of "system degradation" in Incremental Development?

A$.$ It refers to the software becoming outdated due to lack of updates.

B$.$ It occurs when the system's architecture becomes overly complex and less maintainable over time.

C$.$ It describes the process of breaking down large systems into smaller, manageable increments.

D$.$ It indicates a reduction in system performance due to hardware failures.