Which of the Following Requirements Is Common to Both the Z-Test

Which of the following requirements is common to both the z-test and the one-sample t-test?

A) Alpha is selected to be 0.01.
B) The raw score population forms a normal distribution, and the population mean and standard deviation are known.
C) The standard deviation of the raw score population is estimated by $S_{X}$ .
D) There is one random sample of interval or ratio scores.