please help me with the following. Note: there is no data missing.

6) (MULTIPLE CHOICE: identify the one best answer below and explain your reasoning for each option): When Australia experiences a trade account surplus of $20 billion and current account surplus of $20 billion in some year, then in that year: a. The Australian government has a budget surplus of $40 billion. b. The Australian government has a budget deficit of $-40 billion. c. Australian net foreign investment equals $20 billion. d. Australian net foreign investment equals $-20 billion. e. National (Public plus Private) savings total $20 billion for that year