which of the following is not a warning sign that would alert a taxpayer to tax-related identity theft?

a) IRS reject codes indicate the taxpayer's SSN already has been used.

b) taxpayer receives an IRS notice regarding a tax return after all tax issues have been resolved, refund was received or balance due was paid.

c) taxpayer has found unidentifiable charges on their credit cards.

d) taxpayer receives notice that indicates they had wages from an employer they can not identify.