Given that main effect A has a levels main effect B has b le

Given that main effect A has a levels, main effect B has b levels, and n is the sample size of each treatment, and N is the total sample size, the degree of freedom associated with SSB is ___ in the in-depth analysis.

degree of freedom associated with SSB is b-1
SSA is a-1
SSAB is (a-1)(b-1)
SSError = ab(n-1)
SST = abn - 1