Final answer:
The four key parties involved in a loan signing are the borrower, lender, cosigner, and collateral holder.
Step-by-step explanation:
The four key parties involved in a loan signing are:
The borrower - the individual or entity seeking the loan.
The lender - the bank or financial institution providing the loan.
The cosigner - an individual or firm who legally pledges to repay some or all of the money if the borrower fails to do so.
The collateral holder - the entity that holds the rights to seize and sell the collateral if the borrower defaults on the loan.