Dell Computer's online tools for selecting and customizing a new PC are a type of:

The correct choice is the Decision Support System (DSS). Regulatory systems like those provided by Dell allow users to input their preferences and specific requirements, and in return, the system provides tailored recommendations based on those criteria.

A Decision Support System is designed to assist in the decision-making process by analyzing data, providing relevant information, and guiding users through various options in a structured manner. In the case of Dell's online tools, they help customers assess different configurations, components, and prices based on individual needs, facilitating an informed selection process when choosing a new PC.

The other options, while related to technology, do not fit the context of Dell's customization tools. A clinical decision support system (CDSS) is used in the medical field for supporting healthcare decisions, web-based GIS is related to geographic information systems used for spatial data analysis, and intelligent agents perform tasks autonomously based on user preferences but do not typically offer the structured decision-making support that a DSS does.