Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is (are)

• A

  Impure Cu strip is used as cathode
• Correct answer
  B

  Acidified aqueous $\mathrm{C}\mathrm{u}\mathrm{S}{\mathrm{O}}_4$ is used as electrolyte
• Correct answer
  C

  Pure Cu deposits at cathode
• Correct answer
  D

  Impurities settle as anode-mud.

Hence, the correct answer is options: 'B', 'C', 'D'.