Final answer:
A vendor credit form is used in business accounting to document reductions in the amount owed to a vendor, often due to returned goods or billing corrections.
Step-by-step explanation:
A vendor credit form is typically used in business accounting to track and record transactions related to credits received from suppliers or vendors. When a business returns goods to a vendor or points out a billing error, the vendor often issues a credit to the business's account, reducing the amount the business owes to the vendor.
Therefore, the correct answer to the question is that a vendor credit form is used to record expenses that result in a reduction in the amount we owe the vendor, which corresponds to Option 4.