A university is studying the residency patterns of its students. The findings of its study are summarized in the contingency table below. What are the degrees of freedom for the2distribution when testing the independence of the two factors?

Dormitory Apartment Home Row Totals

Senior 11 20 7 38

Junior 23 18 10 51

Sophomore 30 11 15 56

Freshmen 20 6 11 37

Column Totals 84 55 43 n=182

Group of answer choices

a. 6

b. 10

c. 11

d. 12