To migrate BO report from one environment to other following can be used
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BIAR Files
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Designer
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Import Wizard
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Report Conversion Tool
A,C
Correct answer
Explanation
BIAR files package entire reports and universes for transport between environments. Import Wizard handles the BIAR import process. Designer is for universe creation, not migration. Report Conversion Tool converts between report formats (like Desktop to Web Intelligence), not for environment migration.