What are the similarities and differences among the three main types of audits. Begin by identifying the three main types of audits in the table. Then select an X in the box for each item that describes the purpose and nature of each type of audit. (If an input field is not used in the table or an item does not apply, leave the input field empty. Abbreviations used: CPA = Certified Public Accountant, GAO Auditors = Government Accountability Office Auditor, IRS Auditors = Internal Revenue Service Auditors.) Frequency of audits performed by: \begin{tabular}{ll|l|l|} CPAs & & \\ \hline GAO auditors & & \\ \hline IRS auditors & & \\ \hline Internal auditors & & \\ \hline \end{tabular}