Consider the control system shown in the following figure

Consider the control system shown in the following figure and the statements given below.
1. The system is of second order.
2. Basically, the system is having positive feedback.
3. The system is of type 1.
4. The dimension of the output is not the same as that of the input. Of these statements—

1. 1 and 2 are correct
2. 2 and 4 are correct
3. 2, 3 and 4 are correct
4. 1, 2 and 3 are correct

Here,
G(s) = 9 s (s + 3)
H (s) = – s² 9
T.F. of the given system

=	G(s)
	1 + G(s) H(s)

=	9/s(s + 3)
	1 + {9/s(s + 3)}(– s²/9)

=	9	=	3
	s² + 3s – s²		s

form, this we conclude that only statement 2 and 4 is correct.
Hence alternative (B) is the correct choice.