30. Which of the following methods can be used for the separation of a mixture of Li⁺, Na⁺, and K⁺, and NH4⁺ in real-world samples?
(i) Ion-exchange chromatography
(ii) Ion-pair chromatography
(iii) Ion-exclusion chromatography
(iv) Reversed-phase high-performance liquid chromatography
(v) Normal-phase high-performance liquid chromatography
(vi) Size-exclusion chromatography
(vii) Capillary zone electrophoresis
(A) i, ii, vii
(B) i, iii, iv
(C) ii, iv, v
(D) iii, vi, vii
(E) iv, v, vi