What type of software allows for viewing, printing, and highlighting PDFs?

The correct choice pertains to freeware, as it encompasses software that can be downloaded and used for free, often including functionalities that cater to basic needs like viewing, printing, and annotating PDF files. There are many freeware applications available specifically designed for handling PDF documents, allowing users to perform these essential tasks without incurring any costs. This aligns well with the needs for basic PDF management.

Database software, on the other hand, focuses on organizing and managing data in structured formats. While it can handle different file types, its primary function is not centered on viewing or highlighting PDF files. Productivity suites, which often include tools for word processing, spreadsheets, and presentations, may also offer PDF functionality but typically deal with broader tasks rather than specializing in PDF management alone. System software, which includes operating systems and utility programs that manage hardware and core functions of a computer, does not directly pertain to the manipulation of PDF documents or their viewing capabilities. Thus, freeware stands out as the most relevant and appropriate category for software designed to interact with PDFs.