Final answer:
The answer is 4) Audit engagement. The attestation standards define three types of engagements: review engagements, compilation engagements, and agreed-upon procedures engagements. An audit engagement is a higher level of assurance engagement where the auditor provides an opinion on the fairness of the financial statements.
Step-by-step explanation:
The answer is 4) Audit engagement. The attestation standards define three types of engagements and related forms of conclusions: review engagements, compilation engagements, and agreed-upon procedures engagements. These engagements are used by auditors to provide various levels of assurance or objective examination of subject matter. An audit engagement is a higher level of assurance engagement where the auditor provides an opinion on the fairness of the financial statements.