Determine the domain and range of the relation. State whether the relation is a function or not a function. 
A. domain: {13, 1, 3, 5}
range: {1, 7, 9}
not a function
B. domain: {13, 1, 3, 5}
range: {1, 7, 9}
function
C. domain: {1, 7, 9}
range: {13, 1, 3, 5}
not a function
D. domain: {1, 7, 9}
range: {13, 1, 3, 5}
function
Answer: C
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