Which of the Following Statements Is True About the T-Distribution

Which of the following statements is true about the t-distribution?

A) For small sample sizes, the t-distribution has the same properties as the normal curve.
B) For large sample sizes, the t-distribution has the same properties as the normal curve.
C) Like the Normal distribution, the t-distribution is symmetric for small n.
D) Since population standard deviation is usually unknown, the standard error uses the sample standard deviation to estimate population standard deviation.