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A. If a < b
B. If a ≤ b
C. If the relationship between a and b cannot be established
D. If a > b
Explanation:
I. (a + 6)(a + 5) = 0
=> a = -6, -5
II. (b + 5)(b + 1) = 0
=> b = -5, -1 => a ≤ b
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