It's "computers", because they're the subject of the verb to be.
I think.
They are giving credit to where ever they got their information.
Answer:
Paraphrasing is when you read someone's idea or concept from another source and then put it into your own words. It is perfectly acceptable to paraphrase another author's research IF you cite it and give them proper credit for their ideas--even if those ideas are now in your own words.
Explanation:
Walked is the verb in the sentence
