Determine Whether the Graph Illustrated Represents a Function $\mathcal { R }$

Determine whether the graph illustrated represents a function. Give the domain and range of the relation or function.
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A) function domain: {x|- 7 < x < 7} range: {y|- 7 < y < 7}

B) not a function domain: $\mathcal { R }$ range: $\mathcal { R }$

C) function domain: $\mathcal { R }$ range: $\mathcal { R }$
D) not a function domain: {x|- 7 < x < 7} range: {y|- 7 < y < 7}