In the scenario described, Party A would be considered the principal employer based on the principle of vicarious liability. This means that even though Party B is supervising the contract labor deployed by Party C, Party A ultimately holds the liability as the principal employer. In Kolkata, India, the legal provisions regarding principal employers and contract labor are governed by various labor laws and regulations. To ensure compliance and mitigate risks, it is crucial for all parties involved to have clear contractual agreements that explicitly define the roles and responsibilities of each entity. Additionally, having a standard contract template specifically tailored for hiring contracts can provide legal protection and ensure that all necessary details are covered. It is recommended to consult with legal experts or HR professionals well-versed in labor laws to draft robust contracts that align with the legal provisions in Kolkata, India.