How is DNA technology used in science, society, and in medicine? Which of the following would be considered an example of biotechnology?

How is DNA technology used in science, society, and in medicine? Which of the following would be considered an example of biotechnology?

-Growing cancer cells in a petri dish

- Developing a rice plant that produces a precursor to Vitamin A

- Brewing beer

-Crossing a wild corn plant with a domesticated corn plant