Graph the Linear Function and Give the Domain and the Range

Graph the linear function and give the domain and the range. If the function is a constant function, identify it as such.
- $f(x) =\frac{1}{4} x+6$

A) $\mathrm { D } = ( - \infty , \infty )$ , $\mathrm { R } = ( - \infty , \infty )$

B) $\mathrm { D } = ( - \infty , \infty ) , \quad \mathrm { R } = ( - \infty , \infty )$

C) $D = ( - \infty , \infty ) , \quad R = ( - \infty , \infty )$

D) $D = ( - \infty , \infty ) , \quad R = ( - \infty , \infty )$