Which of the items in the table are identified as foreign aid?
- Aforeign direct investment: no; official development assistance: no; portfolio investment flows: yes
- Bforeign direct investment: no; official development assistance: yes; portfolio investment flows: no
- Cforeign direct investment: yes; official development assistance: no; portfolio investment flows: yes
- Dforeign direct investment: yes; official development assistance: yes; portfolio investment flows: no