Greg has one employer and expects no changes to his tax situation for next year. He received a large refund after filing his 2019 tax return. He would like to pay less in taxes throughout the year, even if that means a lower refund when he files his 2020 return. Which of the following actions is most likely to help Greg achieve this goal?

1. Complete only Steps 1 and 5 of the 2020 Form W-4, entering personal information and filing status and signing the form. Tax will be computed only on the standard deduction amount and tax rates for Greg's filing status.

2. Complete 2020 Form W-4, Step 4c, and enter a negative amount of tax to be withheld each pay period.

3. Complete 2020 Form W-4, Step 4c, and enter an additional amount of tax to be withheld each pay period.

4. Purchase an education savings bond for his dependent child.