State the Domain and Range of the Function $$f ( x ) = \sqrt { 25 + 8 ^ { - x } }$$

Multiple Choice

State the domain and range of the function.
- $$f ( x ) = \sqrt { 25 + 8 ^ { - x } }$$

A) domain: $( - \infty , \infty )$ ; range: $( 0,5 )$
B) domain: $( - \infty , \infty )$ ; range: $( - \infty , \infty )$
C) domain: $( - \infty , \infty )$ ; range: $( 5 , \infty )$
D) domain: $( 0 , \infty )$ ; range: $( - \infty , \infty )$