Under the principle of agency law, such an assignment transfers the liability for the service...

A non-delegable duty is a legal responsibility that cannot be entirely transferred to another party (such as an independent contractor) under agency law. While a company may hire third-party providers, the courts often hold that certain responsibilities—particularly those involving safety and legal compliance—remain with the hiring entity. This is particularly significant in the context of security services, where liability can still rest with the client company even if services are outsourced.

Delegable duty (B) is the opposite and not applicable in this context.

Non-Crime duty (C) is not a recognized legal term.