The BEST way to obtain senior management support for investment in a control implementation would...

Residual risk is the risk that remains after applying risk responses, such as avoidance, mitigation, transfer, or acceptance. It represents the level of exposure that the organisation is willing to tolerate or assume. Residual risk should be aligned with the organisation’s risk appetite and risk tolerance, which are determined by senior management. Therefore, the best way to obtain senior management support for investment in a control implementation would be to articulate the reduction in residual risk that the control would achieve. This would demonstrate how the control would help the organisation meet its riskobjectives and reduce the likelihood or impact of adverse events. References = ISACA CRISC Review Manual, 7th Edition, Chapter 1, Section 1.3.2, page 25.