When economists use Ricardian Equivalence, what reasoning is behind it?

• Households consider future ramifications of current government policies and adjust their savings/spending accordingly which decreases the effectiveness of fiscal policy.
• Households consider future ramifications of current government policies and adjust their savings/spending accordingly which decreases the effectiveness of fiscal policy.
• Supply and household savings are not affected by tax cuts.
• Supply and household savings are not affected by tax cuts.
• Increasing household consumption is the goal as government increases spending and decrease household savings.