An octahedral void is present at each edge of the FCC lattice. How much of each of these voids belong to each unit cell?

Q. How many of the following statement(s) is/are incorrect regarding tetrahedral voids in fcc lattice?
a) Each body diagonals contains 2 tetrahedral voids
b) Each tetrahedral void contributes $\frac{1}{4^{th}}$ part to a unit cell
c) One tetrahedral void is present at the body centre of unit cell
d) Each face diagonals contains 2 tetrahedral voids

Q. An element crystallises in a face-centred cubic (fcc) unit cell with edge length $a$. The distance between the centres of two nearest octahedral voids in the crystal lattice is:

Q. An element crystallises in a face-centred cubic (fcc) unit cell with edge length $a$. The distance between the centres of two nearest octahedral voids in the crystal lattice is:
(JEE Main 2020)

Q. An atom Y crystallizes in fcc unit cell having an edge length $a=200\sqrt{2}pm$ . What would be the radius of octahedral void present in the unit cell at the body centre?