Final answer:
'Tangible' is not a requirement for a copyrighted work; the work must be original, creative, and fixed in a medium.
Step-by-step explanation:
Copyright Requirements for Works
To qualify for copyright protection, a work must be original, creative, and fixed in a medium that makes it tangible. These criteria ensure that the work is a product of the author's own intellectual effort, has a certain level of creativity, and is captured in a form that can be perceived by others, either directly or with the aid of a device. However, the work does not need to be 'tangible' in the physical sense; it is sufficient that the work can be perceived for a period longer than transitory duration. Therefore, 'tangible' is NOT one of the things a copyrighted work must be, as per the question's options.