The standard form of the equation of a circle with center at \((h, k)\) and radius \(r\) is given by:
\[ (x - h)^2 + (y - k)^2 = r^2 \]
In this case, the center of the circle is \((5, 7)\) and the radius is \(3\).
So, substituting \(h = 5\), \(k = 7\), and \(r = 3\) into the standard form gives:
\[ (x - 5)^2 + (y - 7)^2 = 3^2 \] \[ (x - 5)^2 + (y - 7)^2 = 9 \]
Thus, the correct equation of the circle is:
\[ \boxed{(x - 5)^2 + (y - 7)^2 = 9} \]