According to the CGEIT certification guide, the most effective approach to ensure senior management sponsorship of IT risk management is to integrate IT risk into enterprise risk management (ERM). This is because ERM is a holistic and strategic approach that considers all types of risks that may affect the achievement of the enterprise's objectives. By integrating IT risk into ERM, senior management can better understand the impact and interdependencies of IT risks on the enterprise's performance and value, and can provide more effective oversight and guidance to the IT risk management processes1. The other options are less effective than option D, as they do not address the alignment and integration of IT risk with the enterprise's strategy and objectives. References:= CGEIT certification guide, domain 3: Risk Optimization, section 3.1: Risk Governance, page 86.