select all that are true about the difference between the internal (i.e., managerial) and external (i.e., financial) versions of an organization's income statement.

A) Variable non-manufacturing costs are deductedfromgross margin and not from contribution margin.

B) Variable non-manufacturing costs are deductedfromcontribution margin and not from gross margin.

C) Fixed manufacturing costs are deductedfromcontribution margin and not from gross margin.

D) Variable manufacturing costs are deductedfromgross margin and not from contribution margin.