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Panel bars are typically utilized as a security feature on fire exits in public buildings. Their primary purpose is to allow for quick and safe exit in the event of an emergency while preventing unauthorized entry. This design is especially important in locations that require compliance with fire codes and safety regulations, ensuring that exits remain accessible and functional.

In contrast, residential locking mechanisms generally utilize different types of locks and security devices that are designed for home use and personal privacy, rather than the large, exit-focused systems we see in public buildings. Panel bars are not limited to just exterior doors; they are specifically crafted to address safety needs associated with emergency escapes in public structures. Lastly, safe combinations involve different security components focused on preserving contents within a safe, which does not involve the use of panel bars specifically. Thus, option A is the most accurate representation of where panel bars are typically found.