Daily intake of few cups of green tea lower the risk of stroke, heart disease and certain types of cancer. What could be the reasons for this effect?

1.    Tea is one of the richest sources of antioxidants that neutralize the harmful free radicals

2.    The tea leaves have certain unique proteins that function as repressors of oncogenes thereby reducing chances of cancer

3.    The soluble fibers in tea leaves do not allow cholesterol deposition in arteries thereby reducing chances of stroke and heart disease

Which of the above reason is/are correct?