Using an Integral to Calculate a Sum Over $f(n)$ (Where $n$ Is an Integer) Is a Good Approximation When
A) the n

Multiple Choice

Using an integral to calculate a sum over $f(n)$ (where $n$ is an integer) is a good approximation when

A) the summed values $f(n)$ are individually small.
B) the value of $\boldsymbol{f}(\boldsymbol{n})$ varies only very slowly with $\boldsymbol{n}$ .
C) the value of $f(n)$ goes to zero as $n$ goes to infinity.
D) the value of $f(n)$ goes to zero as $n$ goes to zero.
E) All of the conditions above are true.