Final answer:
To facilitate an easier visual search task, enhancing the pop-out effect is the most effective strategy. Increasing set size, number of target features, or number of targets would make the task more difficult by adding complexity.
Step-by-step explanation:
According to the web module, to make a visual search task easier, one should enhance the pop-out effect. This can be achieved by making the target visually distinctive from non-targets in the display. The pop-out effect occurs when the target's features are salient enough to stand out from the distractors, enabling quicker and more efficient detection by the viewer.
On the contrary, increasing the set size, which means adding more items to the visual scene, or increasing the number of target features, would likely make the task more difficult as it creates more information for the viewer to process. Similarly, increasing the number of targets can be counterproductive unless those targets are significantly different from the distractors and from each other.
The key to an easier visual search is to minimize visual clutter and maximize distinction between targets and non-targets. This strategy leverages the brain's ability to rapidly identify items that 'pop-out' due to their unique characteristics.