In optimal allocation sampling, the necessary sample size of each stratum is determined based:
A. solely on the stratum's size relative to a defined target population.
B. on the number of heterogeneous strata identified in a defined target population.
C. on the number of homogenous strata identified in a defined target population.
D. on the relative size of the stratum as well as the variability within the stratum.
E. solely on the stratum's relative importance to a study.
Answer: D
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