Question: In a PSS (Packet-switched Streaming Service) application, utilizing attributes from UAProf for device profiling, what does the `PixelAspectRatio` attribute primarily indicate about the device's display?
Option 1: The total number of pixels available on the screen
Option 2: Whether the device supports color or grayscale only
Option 3: The ratio of the device's screen width to its height in inches
Option 4: Ratio of pixel width to pixel height for display rendering
Explanation: Understanding the `PixelAspectRatio` is crucial for optimizing video streaming quality on various devices. This attribute specifically informs about how each pixel is rendered (in terms of width vs. height), vital for maintaining the original video aspect ratio and preventing distortion, thus enhancing the overall PSS experience.