How can symmetry be applied to a sketch in SolidWorks?

Applying symmetry in a sketch in SolidWorks is effectively achieved by using the "Mirror Entities" tool. This tool allows you to select specific sketch entities and create a mirrored counterpart about a defined axis or line of symmetry. This approach not only saves time by automating the symmetry process but also ensures precision and maintains the relationship between the mirrored entities, making it easier to modify them as a cohesive design.

The other choices, while they involve sketching, do not appropriately embody the systematic methods SolidWorks offers for applying symmetry. For instance, utilizing a symmetry tool that distributes points evenly may not exist specifically as described, and drawing without any specific tool lacks the precision and efficiency afforded by the built-in features. Similarly, creating a copy and flipping it manually can lead to misalignment and inconsistencies, which is why the mirror tool is favored for maintaining an accurate and symmetrical design.