To view the data of a DataFrame in a tabular format within a Databricks notebook, the display() command is used. This command not only allows you to see the data in a table but also provides the option to quickly create various visualizations directly from the data. For example:

%python
display(data)

By clicking the down arrow next to the table, you can select from a list of visualization types to represent your data visually. Therefore, the correct answer is display(df).