When a unit ramp input is applied to the unity feedback system having closed loop transfer function\(\frac{{C\left( s \right)}}{{R\left( s \right)}} = \frac{{Ks + b}}{{{s^2} + as + b}},(a > 0,b > 0,K > 0)\), The steady state error will be

• A. 0
• B. \(\frac{a}{b}\)
• C. \(\frac{{a + k}}{b}\)
• D. \(\frac{{a - k}}{b}\)