The first two rows of Routh array of a third order system are

select the correct answer from the following:
(a) system has one root in the RHP.
(b) system has two roots on \(j \omega\) axis at \(s= \pm j\) and third root in the LHP.
(c) System has two roots on \(j \omega\) axis at \(s= \pm j 2\) and third root in the LHP.
(d) System has two roots on \(j \omega\) axis at \(s= \pm j 2\) and third root in the RHP.

3 S 2 S 2 4 2 4