The following equation is that of a parabola. Using its vertex and the direction in which it opens, solve for its domain and range, and tell if the given relation is a function or not.
y² + 4y - x - 3 = 0

• A. Domain: (- 7, ∞), Range: (- ∞, ∞): Not a function
• B. Domain: [- 7, ∞), Range: (- ∞, ∞): Not a function
• C. Domain: (- ∞, ∞), Range: [- 7, ∞): Not a function
• D. Domain: (- ∞, ∞), Range: (- 7, ∞): Not a function

Answer: (B)