Provide an appropriate response.Using the symbols M and N, give a precise definition of this expression: 
f(x) = -?.
A. For each negative number M there exists a corresponding number N such that x > N ? f(x) > M.
B. For each negative number M there exists a corresponding number N such that x > N ? f(x) < M.
C. For each negative number M there exists a corresponding number N such that x < N ? f(x) > M.
D. For each negative number M there exists a corresponding number N such that x < N ? f(x) < M.
Answer: B
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