Reminder: f € O(9) if there exist integers C > 0 and k > 0 such that f(n) Select all pairs (C, k) that prove f € O(g) if f(n) = 8n2 + 4n and g(n) = n' O k=2, C=10 O k=1, C=8 O k=2, C=6 O k=4, C=9 O k=1, C=12

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