Find the Domain and Range of the Relation $\{ 4 \}$

Multiple Choice

Find the domain and range of the relation. Also determine whether the relation is a function.
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A) domain: $\{ 4 \}$ range: $( - \infty , \infty )$ ; function
B) domain: $\{ 4 \}$ range: $( - \infty , \infty )$ ; not a function
C) domain: $( - \infty , \infty )$ ; range: $\{ 4 \}$ ; function
D) domain: $( - \infty , \infty )$ ; range: $\{ 4 \}$ ; not a function