Which sentence demonstrates proper colon use and parallel structure?

She couldn't believe it: when Dave told her that the company was closing, employees were being laid off, and there was nothing she could do about it$.$

She couldn't believe it when Dave told her: that the company was closing, employees were being laid off, and there was nothing she could do about it$.$

She couldn't believe it when Dave told her that the company was closing, employees were being laid off, and there was nothing she could do about it$.$