Identify Which of the Twelve Basic Functions Listed Below Fit $y = \sqrt { x } , y = \frac { 1 } { 1 + e ^ { - x } }$

Multiple Choice

Identify which of the twelve basic functions listed below fit the description given.
-The two functions with bounded domains

A) $y = \sqrt { x } , y = \frac { 1 } { 1 + e ^ { - x } }$
B) $y = e ^ { x } , y = \ln x$
C) $y = \sin x , y = \cos x$
D) $y = \sqrt { x } , y = \ln x$