A constant \(\mathrm{M}\) circle is described by equation

\[
x^{2}+2.25 x+y^{2}=-11.25
\]

where \(x=\operatorname{Re}[\mathrm{G}(j \omega)]\) and \(y=\operatorname{Im}[\mathrm{G}(j \omega)]\). The value of \(\mathrm{M}\), is
(a) 1
(b) 2
(c) 3
(d) 4.