Answer:
d. done nothing ethically wrong
Explanation:
In the scenario being described, it can be said that the writer has done nothing ethically wrong. This is because the writer did not plagiarise any of the material from the manuals that he has read, instead, he simply read them in order to stimulate ideas for his manual. Since he did not use any of the direct material from the manuals he read, then he did not violate copyright law, violate the warranty, or even take advantage of the fair-use concept.
