Which video system offers the highest resolution?

The choice of XVGA as the video system offering the highest resolution is justified by understanding the resolution specifications of each system. XVGA, or Extended Video Graphics Array, typically supports a resolution of 1024 x 768 pixels, which is an enhancement from the original VGA that only accommodates up to 640 x 480 pixels.

Moving to SXGA, it provides a resolution of 1280 x 1024 pixels, which exceeds XVGA's capabilities. UXGA further increases the resolution to 1600 x 1200 pixels, which surpasses both XVGA and SXGA.

Given this context, XVGA would not be correct as it is not the highest resolution option when compared to SXGA and UXGA.

Ultimately, the correct answer is UXGA, as it not only represents a significant upgrade in pixel count from VGA and SXGA but decisively offers the most detailed imagery among these video systems.