What supporting documentation should be included in the transaction file for any purchase made using a third$-$party vendor?

Purchase request, signed special approval, and receipt from the third$-$party vendor.

Name of the merchant and the third$-$party vendor, amount of the transaction, and explanation of why it was necessary to use this particular merchant.

Signed special approval and hard copy statement of account showing the third$-$party vendor transaction.

Name, address, and billing information of the third$-$party vendor and amount of the transaction.