The primary function of a 'certificate of insurance' in the contracting process is to allow one party to:

Explanation

A certificate is a verification document: it lets a hiring party confirm, before work starts, that the other side carries the coverages and limits the contract demands. (a) requires an additional insured endorsement, and the certificate only reports one if it exists. (b) reads the cancellation-notice box as an enforceable promise, when most modern forms expressly disclaim it. (d) describes what the underlying insurance requirement and indemnity clause are meant to accomplish — the certificate merely evidences that the machinery is in place.