Of the following statements about a control system stability the correct statements are

i) If in the absence of input, the output tends towards zero then the system is Bounded input Bounded output stable.

ii) The system is unstable if first column of Routh array of its characteristic equation has all negative terms.

iii) If one or more non repeated roots of characteristic equation are on jω-axis then impulse response of system is bounded hence the system is stable.