Comprehensive and Detailed In-Depth Explanation:

Waves in SAP EWM group outbound tasks for processing. Option B ("Automatically when an outbound delivery order is created") is correct because wave templates with an "Automatic" release method can trigger wave creation upon ODO creation, configured in SPRO: SCM Extended Warehouse Management > Goods Issue Process > Wave Management > Define Wave Templates. Option D ("Manually during planning in the shipping cockpit") is correct as users can manually create waves in transaction /SCWM/SHCO. Option A (warehouse task) is a downstream step, and option C (PMR) is production-related, not wave-specific.