True

False

Can't Say

-1 TO 1

0 TO 1

-INF TO +INF

NONE

$$f(z)=1/(1+e^{-z})$$

$$f(z)=1/(1+e^z)$$

$$f(z)=1/(1+e^{-z})+1/(1+e^{-z})$$

$$1/(1+e^{-z})-\ 1/(1+e^{-z})$$