Which of the Following Is True of the Equation $\left[n>(z \alpha / 2)^{2} \frac{\pi(1-\pi)}{F^{2}}\right.$

Multiple Choice

Which of the following is true of the equation $\left[n>(z \alpha / 2) ^{2} \frac{\pi(1-\pi) }{F^{2}}\right.$
for computing the sample size required to achieve a desired confidence interval half-width for a proportion?

A) The sample size calculated will only be an approximation.
B) The standard deviation need not be calculated first in order to compute the sample size.
C) The value for π is always set at 1.
D) The value for π is never a constant.