CsCl crystallizes in a unit cell that contains the Cs+ ion at the center of a cube that has a Cl- at each corner. Each unit cell contains __________ Cs+ ions and __________ Cl-, ions, respectively.
a. 1 and 8
b. 2 and 2
c. 2 and 1
d. 2 and 4
e. 1 and 1