In the cloning of cattle,a fertilized egg is taken out of the mother's womb and:

• A
  in the eight-cell stage,cells are separated and cultured until small embryos are formed,which are then implanted into the womb of other cows.
• B
  in the eight-cell stage,the individual cells are separated under an electrical field for further development in culture media.
• C
  from this,up to eight identical twins can be produced.
• D
  the egg is divided into $4$ pairs of cells which are implanted into the womb of other cows.