The analyst inputs a function to find the number of transactions that include a brass-colored product. The syntax of which of the following formulas would return that result?
a. =COUNTIF(F2:F30, "brass")
b. =SUMIF(F2:F30, "brass only")
c. =COUNTIF(E2:E30, "=brass")
d. =SUMIF(F2:F30, "=brass")