What is the transfer function of a phase lead compensator? The value of β and τ are given as β < 1 and τ > 0

• A. \(\frac{{\beta \left( {\tau s + 1} \right)}}{{\left( {\beta \tau s + 1} \right)}}\)
• B. \(\frac{{\beta \left( {\tau s + 1} \right)}}{{\left( { \tau s + 1} \right)}}\)
• C. \(\frac{{\beta \left( { \beta\tau s + 1} \right)}}{{\left( { \tau s - 1} \right)}}\)
• D. \(\frac{{\beta \left( { \beta\tau s - 1} \right)}}{{\left( { \tau s - 1} \right)}}\)