The following four situations require a modification to the standard unqualified/unmodified audit report. Identify the modification required

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Question:

The following four situations require a modification to the standard unqualified/unmodified audit report. Identify the modification required for each.

a. Opinion based in part on the report of another auditor.
b. Going concerned.
c. Lack of consistency.
d. Additional emphasis.

Note: please only mention if it's an unqualified or unmodified audit report.