Select the correct statement(s):

• A

  Co-ordination no. of an atom at a lattice point in simple cubic arrangement is 6

• B

  Co-ordination no. of an atom at octahedral site is 8 

• C

  Co-ordination no. of an atom at a lattice point in hcp arrangement is 6 

• D

  Co-ordination no. of an atom at octahedral site is 12