Chris Baker's adjusted gross income on her 2017 tax return was $160,000, which covered a 12-month period. For the 2018 tax year, Baker may avoid the penalty for the underpayment of estimated tax if the timely estimated tax payments equal the required annual amount of

I. 90% of the tax on the return for the current year, paid in four equal installments
II. 110% of prior year's tax liability, paid in four equal installments
Either I or II