Solve the Problem $y = 2 ^ { - x }$

Multiple Choice

Solve the problem.
-Use the graph of $y = 2 ^ { - x }$ to graph the function . Write the domain and range in interval notation $f ( x ) = 2 ^ { - x }$

A)

Domain: $( - \infty , \infty ) \quad$
Range: $( 0 , \infty ) \quad$
B)

Domain: $( - \infty , \infty )$
Range: $( - \infty , 0 )$
C)

Domain: $( - \infty , \infty )$
Range: $( - \infty , 0 )$
D)

Domain: $( - \infty , \infty )$
Range: $( 0 , \infty )$