Which is true regarding leeway space?

A. The leeway space in the maxilla is larger than in the mandible.
B. Leeway space is the difference between the mesiodistal widths of the primary canine, first and second primary molars and the permanent canine, first and second premolars.
C. The most favorable dental arch pattern is one in which leeway space is not excessive.
D. The leeway space per side is about 1.5mm in the lower arch and 1.0mm in the upper arch.