Determine the domain and range of the function. State whether the function is a function or not a function. 
A. domain: {-9, -4, 4, 9}
range: {9, 1}
function
B. domain: {9, 1}
range: {-9, -4, 4, 9}
not a function
C. domain: {9, 1}
range: {-9, -4, 4, 9}
function
D. domain: {-9, -4, 4, 9}
range: {9, 1}
not a function
Answer: A
Mathematics
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