How can you add a data label to a specific data point in an Excel chart?

To add a data label to a specific data point in an Excel chart, you would select the data point and enable data labels. Therefore, the correct answer is:

**By selecting the data point and enabling data labels.**

Here's how you can do it:

1. Click on the chart to select it.
2. Click on the specific data point you want to label (this may take a second click if the data points are grouped).
3. Right-click on the selected data point and choose "Add Data Labels" from the context menu.
4. If you want to format the data label, you can right-click on it again and choose "Format Data Labels" for further customization.