In General. After receipt of a settlement offer, a claimant may: Accept the offer; or In writing, reject the offer and make a counteroffer based on: Dealer quotations for a substantially similar motor vehicle; Advertisements for a substantially similar motor vehicle; or Any other source of valuation for a substantially similar motor vehicle. Duty of Insurer. If an insurer rejects a claimant's counteroffer made pursuant to §A(2) of this regulation, the insurer shall, within 5 business days, send to the claimant a written explanation in clear and understandable language of why the information relied on by the claimant in the counteroffer does not provide a more accurate valuation than the information relied on by the insurer in its offer.