A joint stock limited company is a company consisting of more than a certain number of shareholders, whose entire capital is divided into equal shares, and shareholders only bear limited liability to the company for the amount of capital they recognize as shares, and the company is only responsible for the company's debts with all its assets. Which of the following cases belong to a company limited by shares:. ['Company A and Company B had a field of unattended care, and the two companies negotiated for one year each.', 'Company A was reorganized, and the entire capital was divided into 50,000 shares, which were subscribed by employees and renamed to "x limited liability company".', 'Restructuring of a research institute under the former Ministry of Electronics to establish a state-controlled research and development center.', 'Xiao Zhang, Xiao Wang and others in the village built a village elementary school.']