A test is conducted to compare three difference income tax software packages, to determine whether there is any difference in the average time it takes to prepare income tax returns using the three different software packages. Ten different people's income tax returns are done by each of the three software packages and the time is recorded for each. Which of the following is true?
a. The total degrees of freedom is 30.
b. The between blocks degrees of freedom is 2.
c. The between samples degrees of freedom is 2.
d. The three software packages are the blocks.