During extraction of copper, it is obtained in the form of molten matte. Which of the following is not true?

${\mathrm{Cu}}_2\mathrm{S}$ and some iron sulphides are combined to form copper matte (FeS). Copper is removed during the matte stage, which comes before the final reduction. The silica (sand) ${\mathrm{SiO}}_2$ and coke are combined with the roasted ore before being added to a blast furnace.

Hence the option B, D is correct.