Charlie is preparing a client's return. The client is single but claims his parents as his dependents to qualify him as Head of Household (HOH) filing status. Charlie must do all the following to comply with IRS required due diligence, except:

a) Complete Form 8867, Paid Preparer's Due Diligence Checklist, and submit it to the IRS with the taxpayer's tax return.

b) Charlie must not know or have reason to know that any information used in determining the eligibility of the HOH filing status is incorrect.

c) Charlie must provide documentation to the IRS to substantiate the amounts the taxpayer contributes to his parent's support along with proof of their residency.