A 'certificate of insurance' (COI) provided by a subcontractor to a prime contractor:

解析

A certificate of insurance is an informational snapshot: it says that a described policy was in force when the certificate was issued, and it neither amends the policy nor creates rights. (a) is the single most expensive misconception in construction risk transfer — additional insured status comes from an endorsement to the policy, and the certificate merely reports it. (b) reads the 'cancellation notice' box as a promise; most modern certificates disclaim any duty to notify. (c) mistakes the summary for the contract; only the policy and its endorsements grant coverage.