For a feedback system shown below, If K: = 0 and K, = 5, then steady state error for unit ramp input is 0.2. What will be the new value of K: and Ka if damping ratio is increased to 0.5 without affecting steady state error:

A

$$K_t = 1.5, K_a = 1.25$$

B

$$K_t = 1.5, K_a = 12.5$$

C

$$K_t = 15, K_a = 12.5$$

D

$$K_t = 15, K_a = 1.25$$