Which of the following statement is correct?
A. in body-centred cubic unit cell ,the coordination number is 12.
B. The coordination number of each type of ions in CsCl is 8
C. A unit cell of an ionic crystal shares some of its ions with neighbouring unit cell .
D. If `r_(Na^(+))=95` pm, `r_(Cl^(-))=181` pm, the edge length of unit cell of NaCl is 552 pm.
