57. Company limited by shares: refers to a group of shareholders with a certain number or more, whose entire capital is divided into equal shares, and shareholders only bear limited liability to the company for the shares they recognize, that is, the amount of capital invested, and the company uses all its assets to the company's debts The company responsible. Which of the following is a joint stock company? ['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 "XX Corporation".', 'The research institute under the former Ministry of Electronics was restructured to set up a state-controlled research and development center.', 'Xiao Zhang, Xiao Wang and others in the village set up a village elementary school.']