Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to deal with clients who refuse to pay [title] Call or email your client the day after the payment is due. [step] Send your client a gentle, friendly reminder. They may have forgotten or misplaced the invoice.

Ending1: They will probably not be interested in dropping by to replace it. [title] Repeat the same pattern of decluttering. Ending2: If you don't know the exact date they actually lost the invoice, you may not have to remind them. [substeps] It is reasonable that they might provide them with a more formal reminder. Ending3: Keep this reminder in a safe place, such as your cell phone, and send your client a polite email post your tracking. [substeps] Don't send an email several days before an invoice has been due, either because you see their credit report or because they didn't respond to it quickly enough. Ending4: Your reminder may spur them into action, or at least show them you are aware of the matter. [substeps] For example, say, " hello, this is charlie with willie wonka's chocolate factory.

Answer format: ending1/ending2/ending3/ending4