Which Adobe tool allows developers to create applications for multiple platforms, such as Windows, iOS, and Android?

Adobe AIR is the correct choice because it is specifically designed to allow developers to create applications that run across multiple platforms, including Windows, iOS, and Android. This tool acts as a runtime environment that enables developers to package their applications for different operating systems, ensuring compatibility and functionality across various devices.

In contrast, Adobe Flash primarily focuses on creating animations and rich multimedia content for web browsers, making it less suitable for application development across multiple platforms. Adobe Photoshop, while a powerful tool for image editing and graphic design, does not have the capabilities or infrastructure to facilitate application development. Adobe Animate, although it can create animations and interactive content, is not primarily intended for cross-platform application development in the way that Adobe AIR is. Therefore, Adobe AIR stands out as the go-to tool for building applications that function seamlessly across different operating systems.