$2.$ Explain why public companies are required to have to have an integrated audit? Give an example of a company's actions that provoked the need for the creation of the PCAOB and regulation requirement for an integrated audit of a financial audit of a public company.

$2.$ Describe the differences between the $3$ engagements: $1.$ an audit $($examination$)2.$ a review $3.$ a compilation. What is the level of assurance being offered for each engagement? Give an example of when a business would request each engagement.