Packing efficiency and Density of cell

Packing efficiency of crystals

The correct order of the packing efficiency in different types of unit cells is______________

Assertion:Packing efficiency of body centred cubic structure is 68% Reason:68% is the maximum packing efficiency any crystal can have

Consider the following statements I. bcc structure has maximum packing efficiency II. Percentage of total space filled by the particles is called packing efficiency Which of the above statements is /are true ?