If \(f\left( s \right) = \left[ {\frac{{\left( {s - a} \right)\left( {s - b} \right)}}{{\left( {s - c} \right)\left( {s - d} \right)}}} \right]\) the poles of f(s) are:

• A. s = a and s = 0
• B. s = c and s = d
• C. s = a and s = b
• D. s = 0 and s = ∞