According to IIA guidance, which of the following are macro-level audit activities performed for an assurance engagement of the purchasing department?

1. Obtain and review all purchasing-related audit reports issued within the past year.

2. Meet with the quality assurance group to discuss its previous reports of any purchasing-related findings.

3. Review a memo written by the purchasing manager that outlines ongoing problems with the purchasing software.

4. Request a copy of the report from a purchasing audit conducted last year by an external service provider.