The correct option is It prefixes the name with INPUT_, converts letters to uppercase, and replaces spaces with underscores.

GitHub exposes action inputs to the runtime as environment variables by constructing a name that begins with INPUT_ then converts the input name to all uppercase and replaces spaces with underscores. For an input named build target the resulting environment variable is INPUT_BUILD_TARGET which you can read from the runner environment in a JavaScript action.

It keeps the name as entered and replaces spaces with hyphens is incorrect because GitHub does not preserve the original casing and it does not use hyphens in environment variable names. Hyphens are not valid in typical shell variable names and GitHub replaces spaces with underscores.

It converts the name to lowercase and replaces spaces with underscores is incorrect because GitHub converts the name to uppercase and also adds the INPUT_ prefix.

It prefixes the name with GITHUB_ and leaves the original casing is incorrect because the GITHUB_ prefix is used for default workflow variables such as GITHUB_SHA and is not used for action inputs. Inputs are exposed with the INPUT_ prefix and with uppercase letters and underscores.

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