Suppose Bulgaria produces only two goods: corn and blu rays. The following graph shows Bulgaria's current production possibilities frontier, along with six output combinations represented by black points (plus symbols) labeled A to F.

100 80 PPF 60 BLU RAYS (Millions) LU 40 20 O 20 40 80 80 100 CORN (Millions of bushels)Complete the following table by indicating whether each point represents output combinations that are inefficient, efficient, or unattainable. Check all that apply. Point Inefficient Efficient Unattainable A O O O B O O O C O 0 D O O O E O O O F O O O