"All future costs are relevant." Do you agree? Explain briefly. $$No$.$ Relevant costs are defined as those expected past costs that differ among alternative courses of action being considered. $$Yes$.$ Relevant costs are defined as those expected future costs that differ among alternative courses of action being considered. $$Yes$.$ Relevant costs are defined as those expected past costs that differ among alternative courses of action being considered. $$No$.$ Relevant costs are defined as those expected future costs that differ among alternative courses of action being considered.