Which of the following is NOT typically considered a digital asset?

Storyboard sketches are typically not considered a digital asset because they usually exist in a physical format or as traditional sketches rather than being created or stored in a digital form. Digital assets generally encompass files that have been digitized and can be easily manipulated or managed using software applications. This includes video files, audio files, and still image files, all of which are inherently digital, can be stored, edited, and distributed through digital platforms. Sketches, while they can inform the production process, do not fit into the same category of digital assets unless they are explicitly digitized and saved in a digital format. Hence, storyboard sketches stand apart in this classification, making them the correct answer to the question.