Select the correct set of the statements for an acid type indicator used in a titration :
(i) In general, `pH` range of an indicator is `(pK_(a)-1)` to `(pK_(a)+1)` and indicator shows its characteristic colours in this range.
(ii) In general `pH` range of an indicator is `(pK_(a)-1)` to `(pK_(a)-1)` and indicator does not show its characteristic colours in this range
(iii) In this relation :`pH=pK_(In) +log_(10)((["In"^(-)])/(["HIn"])),pH` value representes `pH` of indicator solution.
(iv) In this relation :`pH=pK_(In) +log_(10)((["In"^(-)])/(["HIn"])),pH` value represents `pH` of resulting solution containing indiactor .

Options

A. I and II
B. II and Iv
C. II and III
D. I and Iv