Provide an Appropriate Response $f_{X}$ , Is the Same as Which of the Following?
(I)

Provide an appropriate response.
-The symbol $f_{X}$ , is the same as which of the following?
(i) $\frac{\partial \mathrm{f}}{\partial \mathrm{x}}$
(ii) $\frac{\partial \mathrm{x}}{\partial \mathrm{f}}$
(iii) $\frac{\mathrm{df}}{\mathrm{dt}}$

A) Only (ii) is correct.
B) Only (iii) is correct.
C) Only (i) is correct.
D) None of the above is correct.