Which of the following best describes 'visual elements' in LMS Substation 2-2?

The best description of 'visual elements' in LMS Substation 2-2 is that they improve the design's clarity and include symbols, colors, and labels. Visual elements play a critical role in any design by enhancing communication and understanding of information presented within a system.

In the context of LMS Substation 2-2, these elements make complex data more accessible and comprehensible. Symbols can represent various equipment or functions, colors can indicate status or convey information quickly, and labels provide clear identification for components. This improves user interaction, as individuals can quickly interpret the visual information, aiding decision-making and operational efficiency.

The other options do not encapsulate the primary purpose of visual elements effectively. Decorative features might enhance aesthetics but do not contribute to clarity or understanding. Data representation based on historical performance may involve visual elements, but it doesn't define what they are. Lastly, stating that visual elements are irrelevant contradicts their foundational role in enhancing a design's effectiveness.