What Is the Correct Representation for the 5% Critical T-Value

Multiple Choice

What is the correct representation for the 5% critical t-value for a sample with 9 degrees of freedom?

A) t_{0.05(2) ,8}
B) t_{0.05(2) ,9}
C) t_{0.025(2) ,8}
D) t_{0.025(2) ,9}