If an internal auditor suspects fraud during an engagement which of the following is expected of the auditor?

If an internal auditor suspects fraud during an engagement which of the following is expected of the auditor?
A . Evaluate the suspected activities to determine whether a forma! investigation is warranted,
B. Immediately inform senior management and the board of the suspected fraud.
C. Ascertain the level of resources needed to formally investigate the fraud, and proceed with the investigation if resources permit,
D. Include in the engagement documentation all possible effects and the potential impact of the fraud to the organization

Answer: A