Jack knows the surface area of a cylinder and its radius. He wants to find the cylinder's height. He needs to rewrite the formula a=2\(\pi\) r (r+h) to find the cylinder's height (h) in terms of the cylinder’s surface area (A) and its radius (r). Which is the correct formula?

a) h = r + \(\frac{a}{2 \pi r}\) 
b) h = \(\frac{a}{2 \pi r}\)
c) h = \(\frac{a}{2 \pi r} - r^{2}\)
d) h = \(\frac{a}{2 \pi r} - r\)