The in-house labor force requires special tools to install or maintain a new piece of equipment. Once the tools are purchased, there will be no...

The in-house labor force requires special tools to install or maintain a new piece of equipment. Once the tools are purchased, there will be no recurring need for the same purchase. Which of the following types of contracting mechanisms would be used to procure the tools?

National buy contract

Fixed type contract

Blanket purchase order

One-time purchase order

My answer to this is: One-time purchase order