Give the Domain and Range of the Relation $( - \infty , \infty )$

Multiple Choice

Give the domain and range of the relation.
-

A) domain: $( - \infty , \infty )$ ; range: $( - \infty , \infty )$
B) domain: $( - \infty , \infty )$ ; range: $\{ 4 \}$
C) domain: $\{ 4 \}$ ; range: $( - \infty , \infty )$
D) domain: $( - \infty , \infty )$ ; range: $( - \infty , 4 ) \cup ( 4 , \infty )$