複選題38 Which of the following statements associated with redox titration is (are) CORRECT?(i) The titration of Fe3+ with Ce4+ can be recorded potentiometrically with Pt and calomel electrodes.(ii) The standard reduction potential of analytes can be determined by recording the potential change during redox titration.(iii) For permanganate titration, KMnO4 serves as an indicator and an oxidant in a basic solution.(iv) To titrate a reducing analyte with excess triiodide, thiosulfate is often used as a titrant for the remaining triiodide in a back titration.(A) i, ii, iii, iv (B) ii, iii, iv (C) iii, iv (D) i, iv (E) ii, iii