Consider the following statements: 1. If any root of characteristic equation has a positive real part the impulse response is unbounded and system is unstable.2. If all the roots of a characteristic equation have negative real parts, the impulse response decays to zero.3. If one or more non-repeated roots of characteristic equation are on jω axis impulse response is bounded but the system is unstable. Which of the above equations are correct?

• A. 1, 2 and 3
• B. 1 and 2 only
• C. 1 and 3 only
• D. 2 and 3 only