Assume you are an external consultant and you want to do an information system Audit $($ISA$)$ and to integrate it with digital forensic $($D$).$ With an aim of ensuring that evidence obtained durring the audit are validated and ensure the CIA of data and to support finacial audit to relies of the ISA for the audited system. $1.$ How did DF fits into ISA? $2.$ How the integration works meet the objective and what componets of DF will be integrated into ISA to meet the objective? $3.$ What controls will be subjected to DF or tested by DF expert and which IS auditors will test? $4.$ Write the steps of the model to be used in this external audit with such objectives from planning to issuing a final audit report?