Answer:Sandbox
Explanation:Hyperledger composers
are tools that gives various users such as owners of Businesses, developers etc ways to create blockchain applications and smart contracts which will help in solving business issues and generally help to improve operational efficiency.
SANDBOXES ARE TESTING ENVIRONMENTS ISOLATED IN ORDER TO ENABLE USERS TO RUN THEIR PROGRAMS EVEN AS TESTING IS ON-GOING, IT IS A HYPERLEDGER COMPOSERS COMPONENT.