Information System Audit consists of the following evidence$-$gathering techniques: Inspection, observation, inquiry, confirmation, recalculation, Re$-$performance, and analytical review. $1.$ Why the following steps are not sufficient, and what impact do they have on the audit and its conclusion? $2.$ Why the following are not sufficient to validate the evidence collected and ensure the CIA of the data entails in the audited system? $3.$ How the integration of Digital forensics can improve this steps and how it will improve $($consider the digital forensics components and process if integrated and consider persistence cyber threats$)4.$ Your reasoning must make sense, this is for a PhD research and use the latest academic papers and references that support your arguments. $5.$ Do the current steps provide auditors with sufficient evidence of what happened in the audited system and what happened before? NB$!$ This question requires good reasoning supported by academic papers for references.