Cest volume profit is used to analyze $$

A$.$ the behaviour of total costs, total revenues, and operating income as changes occur in the output level

B$.$ multple revenue drivers and a single cost driver in special case CVP

C$.$ the behawiour of variable costs af all levels of output

D$.$ the behaviour of some costs and revenues as changes occur in the output level

E$.$ a single revenue driver and multiple cost drivers in special case CVP