The transfer function relating a step input to the output of a control system is:
The natural frequency omega_n of the system and the damping ratio zeta are most nearly:
A. omega_n=2" rad/s; "zeta=0.1
B. omega_n=2" rad/s; "zeta=0.2
C. omega_n=4" rad/s; "zeta=0.1
D. omega_n=4" rad/s; "zeta=0.2