Determine Whether the Relation Represents a Function $\begin{aligned}4 & \rightarrow 8 \\9 & \rightarrow 18 \\14 & \rightarrow 28 \\19 & \rightarrow 38\end{aligned}$

Multiple Choice

Determine whether the relation represents a function. If it is a function, state the domain and range.
- $\begin{aligned}4 & \rightarrow 8 \\9 & \rightarrow 18 \\14 & \rightarrow 28 \\19 & \rightarrow 38\end{aligned}$

A) function
domain: $\{8,18,28,38\}$
range: $\{4,9,14,19\}$

B) function
domain: $\{4,9,14,19\}$
range: $\{8,18,28,38\}$

C) $\text { not a function }$