Let the Laplace transform of a function f(t) which exists for t > 0 be F1 (s) and the Laplace transform of its delayed version f(t ) be F2 * (s). Let F1 * (s) be the complex conjugate of F1 (s) with the Laplace variable set as s = + j .G(s) = F2(s).F1*(s) , then the inverse Laplace transform of G(s) is |F1(s)|2

• A. an ideal impulse (t)
• B. an ideal delayed impulse (t )
• C. an ideal step function u(t)
• D. an ideal delayed step function impulse u(t )