Which statement accurately distinguishes runtime CSS-in-JS from build-time extraction?

Which statement accurately distinguishes runtime CSS-in-JS from build-time extraction?

1. Runtime systems may create or select rules while the app executes; extraction emits supported declarations during the build.
2. Runtime systems bypass the CSS cascade, while extracted styles use it.
3. Extracted styles can evaluate arbitrary browser measurements during compilation.
4. Build-time extraction means the application ships no JavaScript.