Answer the following question based on the information given below.
For a real number $x,$ let
f(x)

= 1/(1 + x),

if x is nonnegative


= 1+ x,

if x is negative

f$^n$(x)

= f(f$^{n – 1}$(x)), n = 2, 3, ....


$r$ is an integer $\geq 2.$ Then what is the value of $f^{r1}(r) + f^r(r)+f^{r+1}(r)$?
 $1$
 $0$
 $1$
 None of these