An owner wants to be an additional insured on the contractor's policy. For the owner actually to have that status, the certificate must be accompanied by:

解析

Only the insurer can add an insured to a policy, and it does so by endorsement; a certificate is a broker's evidence of coverage and its own wording disclaims amending the policy. (d) is the substitute owners most often settle for — a notice provision tells the owner when coverage is ending, it does not make the owner an insured or give it a right to defense. (a) and (b) belong to other transactions entirely, one in the lien law and the other in a credit file.