Which of the following is a common fill device?

The correct answer is KOI-18 because it represents a widely recognized fill device used in various applications, particularly in contexts related to data management and processing. Fill devices are essential for ensuring that data structures are adequately populated, facilitating smooth operations within a system. KOI-18, specifically, has established itself in industries or fields that require consistent and reliable methods for data filling, making it a standard for various operations.

The other choices may either refer to specific devices that may not be as commonly known or might not function as standard fill devices, thus lacking the same level of recognition in related fields. This distinction emphasizes the prevalence and utility of KOI-18 in practical scenarios where efficient data handling is crucial.