Which of these is an example of two functions f$($x$)$ and g$($x$)$ such that f$($x$)<=$ g$($x$)$ when x in $(-3\backslash$pi $/2,-\backslash$pi $/2)$ or x in $(\backslash$pi $/2,3\backslash$pi $/2)?$ a$)$ f$($x$)=-1$ ; g$($x$)=$ x b$)$ f$($x$)=$ x$,$ g$($x$)=-1$ c$)$ f$($x$)=-1$ ; g$($x$)=$ x d$)$ f$($x$)=$ x ; g$($x$)=-1$