Which of the following plans to enrol 1,000-2,000 participants each in metros like Delhi, Mumbai, Hyderabad and Kolkata for phase 3 trials of its COVID-19 vaccine Covaxin?

• A. Serum Institute of India
• B. Bharat Biotech International Ltd
• C. Shantha Biotechnics
• D. AstraZeneca
• E. Biological E. Limited