For the quadratic function f(x) = -x² + 6x - 5, which of the following statements is true?

✓ Correct Answer: Option C

For a quadratic function f(x) = ax² + bx + c, the x-coordinate of the vertex is given by -b/(2a). Here, a = -1 and b = 6. So, the x-coordinate of the vertex is -6 / (2 * -1) = -6 / -2 = 3.