A single tank process has been operating for a long time with an inlet flow rate of 10m3/min. The operator increased the flow rate suddenly at t=0 by 20%, and the liquid level in the tank changed, as shown in Figure below. The process gain and the time constant for the process are: Process gain =2min/m2 Time constant =5min Process gain =2min/m2 Time constant =2min Process gain =5min/m2 Time constant =5min Process gain =5min/m2 Time constant =2min