A process is initially at steady state with its output y=l for an input u=l. The input is suddenly changed to 2 at time t=0. The output response is y(t)=1+2t. The transfer function of the process is

• A. 2/s
• B. <img src="/_files/images/chemical-engineering/process-control/385-624-1.png">
• C. <img src="/_files/images/chemical-engineering/process-control/385-624-2.png">
• D. <img src="/_files/images/chemical-engineering/process-control/385-624-3.png">