Answer:
D. Ideas cannot be copyrighted or trademarked, while song lyrics can be copyrighted.
Copyright protection applies to original works that are fixed in a tangible form, such as being written down or recorded. This means that song lyrics are eligible for copyright protection because they are fixed in a tangible form, like sheet music or a recording. However, ideas by themselves cannot be copyrighted or trademarked because they are not fixed in a tangible form, they are not considered a creative work. Copyright applies to the expression of an idea, not the idea itself. Patents may provide protection to some ideas, but only if they are new, useful and non-obvious.