Error Analysis. Below is the solution (possibly, with errors) for the derivative of the given function \( f ( x ) = \sqrt { 3 x - 7 } \) using the differentiation formulas. Which of the following step(s) is/are the error(s) in the solution?
i. \( f ^ { \prime } ( x ) = \frac { 1 } { 2 } ( 3 x - 7 ) ^ { \frac { 1 } { 2 } - 1 } ( 3 ) \)
ii. \( f ^ { \prime } ( x ) = \frac { 3 } { 2 } ( 3 x - 7 ) ^ { \frac { 1 } { 2 } } \)
iii. \( f ^ { \prime } ( x ) = \frac { 3 } { 2 \sqrt { 3 x - 7 } }\)