When creating an overview visualization of a large dataset, What is the most important factor to consider?
1) Use many different colors to make it appealing to draw the viewer in to investigate further
2) Display only an important subset of the datapoints so as to not overwhelm the user
3) Pack as many details as possible into the display to be as efficient and informative as possible
4) Display all of the data using a simple representation and axes that spread the data out as much as possible