In its 2022 published accounts, Crystal Bank suffered a major decline in its market positioning, sliding from third to eighth position in the industry. That development was not surprising to some analysts who had noticed high labor turnover, a high level of loan provisioning and rising incidents of fraud and forgeries in the bank in the last three years. Concerned to reverse this trend, the board of Crystal Bank engaged your services, as an OD Specialist, to study the bank and identify the major issues that needed to be addressed. Question: Please discuss four of the data gathering techniques available to use in diagnosing the bank and highlight the limitations of each one of them