Read the following text carefully and answer the questions (4 and 5).

Liang Wenfeng is a Chinese entrepreneur and Al researcher born in 1985 in Mililing village, Tanba town, Wuchuan, Guangdong, China. Both his parents worked as primary school teachers. He studied at Zhejiang University where he obtained a Bachelor of Engineering in Electronic Information Engineering in 2007 and a Master's in Information & Communication Engineering in 2010.

In July 2023, Líang founded DeepSeek, an Al company based in Hangzhou, Zhejiang, focused on developing large language models (LLMs) and artificial general intelligence (AGI). DeepSeek is funded by High-Flyer. One of its first major achievements was the launch of DeepSeek-R1 on 20 January 2025: this is a 671-billion-parameter reasoning model, built using 2,048 Nvidia H800 GPUs, at a cost of about US$5.6 million, emphasising resource efficiency. DeepSeek-R1 was released with detailed technical documentation and made open source.

Shortly after its release, the DeepSeek app overtook ChatGPT to become the #1 free app on the US iOS App Store, causing significant attention and disruptions in markets. On 27 January 2025, the day after DeepSeek's launch, Nvidia's shares dropped as much as 17%, wiping out nearly US$593 billion in market value. This loss marked what many described as the largest one-day market capitalization loss ever for a U.S. company.