Q. A linear system at rest is subject to an input signal r(t)=1-e-t. The response of the system for t>0 is given by c(t)=1-e-2t. The transfer function of the system is:

• (A) (s+2)/(s+1)
• (B) (s+1)/(s+2)
• (C) 2(s+1)/(s+2)
• (D) (s+1)/2(s+2)