$\text { The term } z _ { \alpha / 2 } \left( \frac { \sigma } { \sqrt { n } } \right) \text { refers to the }$

Multiple Choice

$\text { The term } z _ { \alpha / 2 } \left( \frac { \sigma } { \sqrt { n } } \right) \text { refers to the }$

A) unbiased estimator.
B) confidence interval.
C) maximum error of estimate.
D) interval estimate.