Final answer:
In 2012, brand rankings featured Apple as a standout in the personal computers sector. Meanwhile, Walmart and Toyota were notable in their respective industries, along with energy sector leaders like Sinopec Group and Royal Dutch Shell.
Step-by-step explanation:
According to the 2012 rankings, some of the world's most valuable brands included Apple, which was highly recognized in the personal computers sector. While the specific list of top brands from 2012 is not mentioned in the provided reference materials, other notable companies that have been recognized for their brand value in various fields include Walmart, which is a top corporation with revenues comparable to the GDP of many countries, and Toyota, which stands out in the automobile industry.
Other prominent corporations that have been listed among the most valuable in terms of brand and influence in different years are Sinopec Group, State Grid, and China National Petroleum in the energy sector, Royal Dutch Shell in the oil industry, and Saudi Aramco which has been a leading brand in the same domain.