Which of the Following Statements Is Not True About the T-Distribution

Which of the following statements is not true about the t-distribution?

A) Like the normal distribution, the t-distribution is symmetric and unimodal.
B) The t-distribution is generally bell-shaped, as sample size increases the shape of the t-distribution gets closer to the shape of the normal distribution.
C) Since population standard deviation is usually unknown, the standard error uses the sample standard deviation to estimate population standard deviation. The formula is SEest = s/
D) All of these statements about the t-distribution are true.