To Compute a Z-Score, Which of the Following Formulas Would $\frac{(\text{y} - \text{mean}) }{\text{sd}}$

Multiple Choice

To compute a Z-score, which of the following formulas would one use:

A) $\frac{(\text{y} - \text{mean}) }{\text{sd}}$
B) $\frac{(\text{x} - \text{mean}) }{\text{N}}$
C) $\frac{(\text{x} - \text{mean}) }{\text{sd}}$
D) $\frac{(\text{x} - \text{mean}) }{\text{y}}$