I for a Goodness-Of-Fit Test, the Number of Degrees of Freedom

i. For a goodness-of-fit test, the number of degrees of freedom is determined by k - 2, where k is the number of categories. ii. The sum of the expected frequencies in a goodness-of-fit test need not equal the sum of the observed frequencies.
iii. A goodness-of-fit test is a nonparametric test involving a set of observed frequencies and a corresponding set of expected frequencies.

A) (i) , (ii) , and (iii) are all correct statements.
B) (i) and (ii) are correct statements but not (iii) .
C) (i) and (iii) are correct statements but not (ii) .
D) (ii) and (iii) are correct statements but not (i) .
E) (iii) is a correct statement, but (i) and (ii) are false.