Answer:
The correct answers are:
1. Last year our design received awards for innovation, quality, and usability.
2. The executive suite was initially skeptical when IT proposed using wikis to streamline work processes, communication, and information access.
3. Realigning the paper tray, closing the lid, or re-entering your code usually fixes the copier.
Step-by-step explanation:
Commas are used to separate ideas or groups of thought one from the other. These are the most common punctuation marks used to separate one list item from another one. The final items from a list usually have the word "and" or "or", and in English, we put on a comma after them who is called "Oxford Comma.
Commas helps us separate series of sentences, nouns, adjectives, verbs, and phrases.
In the examples given:
In answers 1 and 2: commas separate a list of nouns, and in the end, we can appreciate the Oxford Comma.
In answer 3: commas separate a list of predicates, and again, we can appreciate the Oxford Comma.