How can you make certain sections optional in a Razor Layout View?

Using @section Optional {}
Using @section Optional { ... }
Using @if (IsSectionDefined("Optional")) { ... }
Using @optional { ... }

In a Razor Layout View, you can make sections optional by checking if the section is defined using @if (IsSectionDefined("Optional")). This way, the section will only be rendered if it's defined in the child view. The other options are not valid approaches for making sections optional.

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