The strength of an aqueous NaOH solution is most accurately determined by titrating:
(Note: consider that an appropriate indicator is used)
A . Aq. NaOH in a pipette and aqueous oxalic acid in a burette
B. Aq. NaOH in a volumetric flask and concentrated H₂SO₄ in a conical flask
C. Aq. NaOH in a burette and concentrated H₂SO₄ in a conical flask
D. Aq. NaOH in a burette and aqueous oxalic acid in a conical flask