What is the process for adding a drop shadow to a symbol in Adobe Illustrator?

To add a drop shadow to a symbol in Adobe Illustrator, the correct method involves navigating through the Effects menu. By clicking on the symbol and then selecting Effect followed by Stylize and finally Drop Shadow, you access the appropriate settings to create a drop shadow effect. This sequence allows for the customization of various parameters such as opacity, blur, and offset, enabling finer control over how the shadow appears, enhancing the overall design effectively.

The other options either suggest incorrect sequences or misplace the effects within menus that are not applicable for adding a drop shadow. For example, right-clicking does not directly lead to effects like adding a drop shadow in the correct context, and accessing a drop shadow through Layer Style is more commonly associated with programs like Photoshop, not Illustrator. Therefore, the structured path provided in the first option is the accurate route to apply a drop shadow to a symbol in Illustrator.