What visual cue in the viewfinder indicates that a portion of the frame has maximum exposure?

The visual cue in the viewfinder that indicates a portion of the frame has reached maximum exposure is Zebra Stripes. This feature, often found in professional cameras, overlays a striped pattern on areas of the image that are overexposed, which helps the operator identify highlights that could lead to loss of detail. When shooting, it's crucial to ensure that highlights are not blown out, and the Zebra Stripes serve as an effective warning signal for this.

Other options like the Moire Effect refer to a specific interference pattern that occurs when patterns in an image exceed the resolution limits of the sensor, while Proper Z Blocking is related to video formatting and signal integrity. Set Dressing involves the arrangement of props and equipment within a scene for visual storytelling but does not provide exposure-related feedback. Therefore, Zebra Stripes specifically address exposure levels, making it the correct choice in this context.