Refer to the information provided in Table below to answer the question that follow. Output Consumption (Income) Spending 600 500 1,200 1,000 1,800 1,500 2,400 2,000 3,000 2,500 All Numbers are in $ Billion Net Investment Government Taxes Spending Spending 50 200 200 50 200 50 200 200 50 200 200 50 200 200 200 Refer to Table At an output level of $1,200 billion, there is an unplanned inventory change of Select one: O a. zero b. positive $100 billion. c. negative $200 billion. d. positive $200 billion