Parabola

We are given the equation of the parabola:
Step 1: Standard form of a parabola
The standard equation of a parabola is , where is the distance from the vertex to the focus.
Step 2: Equate the given equation to standard form
Comparing the given equation with , we see that . Thus, we find .
Step 3: Conclusion
The value of is , corresponding to option (a).