Maggie completed her Form W-4 based on her wages as a waitress. However, she has more tip income than she expected. What could she do to make sure her withholding is adequate?

A) She doesn't need to be concerned because tip income is exempt from withholding.

B) She could use the IRS Withholding Calculator and then submit a new Form W-4 to her employer.

C) As long as her Form W-4 indicates she is single, she will be fine.

D) She is required to make estimated payments on her tip income.