Below are some of the steps completed in the titration process.

(i) add base from the buret to the acid.
(ii) transfer a known volume of acid to an erlenmeyer flask.
(iii) add three drops of chemical indicator to the acid.
(iv) position the erlenmeyer flask under the buret.

which lists the steps in the correct order of occurrence?
i, ii, iii, iv
ii, iii, iv, i
iii, ii, i, iv
iv, iii, ii, i