Contact characteristics/clues include which of the following?

The correct choice is informed by the specific elements that constitute contact characteristics, which are vital in understanding interactions within an environment or scenario, especially in relation to perception and analysis.

The elements included in this answer—size, shape, shadow, acoustic highlights, and aspect change—align closely with the fundamental attributes used to interpret how objects or elements can be identified and differentiated through various physical traits and behaviors.

Size refers to the dimensions of an object, which can affect how it is perceived relative to other objects or the environment. Shape provides a way to categorize objects and understand their function based on familiar silhouettes. Shadows can offer additional cues about the position and form of objects, helping to establish spatial relationships. Acoustic highlights relate to sound cues, which can provide important information about an object’s presence and characteristics, especially in environments where visibility is limited. Aspect change refers to variations in an object's appearance based on perspective or viewpoint changes, revealing important details that may not be visible from a still perspective.

The other options, while they contain some relevant terms, mix or misrepresent key characteristics that are vital to understand contact characteristics, leading them to convey less exact or comprehensive information.