vii. A compound forms hcp structure. Number of octahedral and tetrhedral voids in 0.5 mole of substance is respectively
a. 3.011×10²³, 6.022×10²³

b. 6.022×10²³, 3.011×10²³

c. 4.011×10²³, 2.011×10²³

d. 6.011×10²³, 12.022×10²³