Simplify the expression fully and state all domain exclusions: $\frac{y^2-4}{y^2+2y}$

• A. $\frac{y-2}{y}$, where $y\ne 0$ and $y\ne -2$
• B. $\frac{y-2}{y}$, where $y\ne 0$ only
• C. $\frac{y+2}{y}$, where $y\ne -2$ only
• D. $1$, for all real numbers $y$

Answer: (A)