Which activity allows you to read the content of a PDF file?

The activity that specifically allows you to read the content of a PDF file is the option that focuses on reading the text within the document. This function typically utilizes algorithms to interpret the text-based elements of a PDF, making it possible to extract readable content for further processing or analysis.

In contrast, the other options serve different purposes. Extracting PDF data might involve retrieving structured information, which requires a more complex understanding of the document's layout and formatting. Opening a PDF document simply means accessing the file without necessarily reading or extracting its content, while generating PDF content refers to creating a new PDF file rather than interpreting an existing one. Thus, the emphasis on reading aligns perfectly with the function described in the selected option, confirming its suitability for the task at hand.