Which of the following is correct for closest packed structure?

In a closed packed structure

Which of the following statement is correct for a closet packed structure? (i) Each tetrahedral void is surrounded by 4 spheres and each sphere is surrounded by 8 tetrahedral voids. (ii) Each octahedral voids is surrounded by 6 spherus and each sphere is surrounded by 6 octahedral voids. (iii) The number of tetrahedral voids in a closest-packed arrangement is twice the number of spheres. (iv) The number of octahedral voids in a closest-packed arrangement is equal to the number of spheres.

Which of the following is correct for the given structure ?

Which of the following is correct for the given structure ?

Which of the following is correct for the given structure ?

Which of the following is correct when atoms are closely packed?

Which of the following is closest to humans :-

Which of the following is closest to humans :-