Which fact is true regarding the report of the Australian based human rights group 'Walk Free Foundation'?

• A. According to the index, modern slavery is found in all 167 countries. The top five countries in this are from Asia.
• B. Countries that have been estimated to have the lowest modern slavery as a population ratio include Luxembourg, Norway, Denmark, and Switzerland.
• C. Of the 161 countries studied, 124 have criminalized human trafficking in accordance with the United Nations Human Trafficking Protocol, while 90 have developed national action plans to coordinate government actions.
• D. All of the above