Consider the Following Statements About Crystalline Solids: (I)Molecules or Atoms

Consider the following statements about crystalline solids: (i) Molecules or atoms in molecular solids are held together via ionic bonds.
(ii) Metallic solids have atoms in the points of the crystal lattice.
(iii) Ionic solids have formula units in the point of the crystal lattice.
(iv) Molecules in covalent-network solids are connected via a network of covalent bonds.
Which of the statements is true?

A) (i)
B) (ii)
C) (iii)
D) (iv)
E) none