A valid employers' liability insurance certificate must include which of the following?

A valid employers' liability insurance certificate must include the insured's name because this detail identifies the policyholder—the individual or entity that holds the insurance and is protected under the policy. Including the insured's name is crucial for determining coverage rights and responsibilities, as it clearly specifies who the insurance applies to in the agreement.

While other options, such as the insured's address, number of employees, and occupation, might provide additional context or information about the insured risk, they are not strictly required for the validity of the certificate. The primary focus is ensuring that the certificate unambiguously links to the correct insured party, which is why the inclusion of the insured's name is essential.