The organization should first use value stream mapping to help understand the end-to-end flow of user support (A). The ITIL 4 Specialist: Create, Deliver and Support study guide (Section 2.3.1) states: "Value stream mapping is the initial step to visualize and analyze the flow of activities, identifying inefficiencies and delays in service delivery processes." This provides a foundation for addressing user complaints by pinpointing bottlenecks before implementing solutions like collaboration (B), tool integration (C), or skill reviews (D). The guide emphasizes: "Mapping ensures a holistic view, essential for effective planning and improvement." Reference: ITIL 4 Specialist: Create, Deliver and Support, Section 2.3.1 - Value Stream Mapping.