Which one of the following statements concerning net working capital is correct?
a) A decrease in accounts payable increases net working capital, all else constant.
b) Net working capital is equal to long-term assets minus long-term liabilities.
c) The lower the net working capital the greater the ability of a firm to meet its current obligations.
d) The change in net working capital is equal to current assets minus current liabilities.
e) Net working capital is a part of the operating cash flow.