Which of the following statements is/are true about the population growth?

Human population increased more than ten times in the past 500 hundred years. In the twentieth century itself the population has increased four times. Inoculation against epidemics and other communicable diseases, improvement in medical facilities and sanitation contributed to a rapid decline in death rates throughout the world during the last two centuries. All of the above

All of the above

All of the following statements are true about population growth.