When a support departments activities are not fully consumed by other departments $($that is$,$ the support department self$-$consumes some costs$)$:a$)$ We ignore such self$-$consumption.b$)$ Not allocating the self$-$consumption negatively affects the accuracy of allocations.c$)$ We must allocate the self$-$consumption costs to line activities.d$)$ A and B only.e$)$ None of the above.