What Does the Concept of Net Investment Refer To

What does the concept of net investment refer to?

A) The amount of capital stock used up in producing the current year's GDP.
B) The difference between the book value and the replacement value of all capital stock.
C) Gross investment less exported capital goods.
D) Total investment less the amount of capital goods used up in producing the year's output.
E) The amount of depreciation plus the amount of new investment during a given year.