The 95% Confidence Interval for a Population Mean Is Calculated $\pm$

The 95% confidence interval for a population mean is calculated as follows:

A) sample mean $\pm$ (t critical) (estimated standard error)
B) sample mean $\pm$ (.95) (estimated standard error)
C) population mean $\pm$ (.95) (estimated standard error)
D) population mean $\pm$ (t critical) (estimated standard error)