Which of the following methods can users employ to ensure content quality in ArcGIS Online?

Maintaining proper metadata and consistent symbology is essential for ensuring content quality in ArcGIS Online. Metadata provides crucial information about the dataset, including its source, purpose, and how it should be used, which enhances its reliability and usability. Proper metadata helps users to understand the data context, making informed decisions based on the information provided.

Consistent symbology improves the interpretability of the visual data representation. When users apply similar symbols across maps or layers, it helps in creating an intuitive experience, facilitating easier understanding and comparison of information. Overall, when both metadata and symbology are well-managed, it ensures that the data can be accurately interpreted and effectively utilized by others.

Employing random sampling for data accuracy, while useful in some contexts, does not directly enforce or enhance content quality on a general basis for all users. Restricting access can limit usability and sharing, which may hinder collaboration and data sharing. Only using pre-defined applications could restrict innovation and customization, which are essential for many users who have specific needs or workflows. Therefore, maintaining proper metadata and consistent symbology stands out as the most effective method for ensuring high-quality content in ArcGIS Online.