Which of the following statement `(s)` is `(` are`)` correct ?

Options

A. When the radius ration is in the range `0.414-0.732`, a `b.c.c.` arrangement with co`-`ordination no. 8
B. When the ration ratio is in the rage `0.225-0.414`, a tetrahedral arrangement with co`-`ordination no . 4
C. When the radius ratio is in the range `0.155-0.225`, an octahedral arrangement with co`-` ordination no . 6
D. In `B_(2)O_(3)`, smaller cations occupy triangular voids and a planar trigonal arrangement with co`-` ordination no. 3

Explanation

b,d