Statements 1, 3, and 4 reflect good Knowledge Management practice.

Analysts should retain useful notes about effective fixes so that proven solutions can be reviewed, validated, and contributed to the knowledge base. Knowledge content should also be written clearly and simply, avoiding unnecessary technical jargon where the intended audience may not understand it. Most importantly, content should be designed from the customer's or user's perspective so that it supports real tasks and common support needs.

Statement 2 is incorrect because knowledge should not automatically be restricted to internal use. Some knowledge must remain internal for security, technical, or operational reasons, but suitable content should be exposed through customer-facing knowledge bases and self-service where this improves support outcomes.

Knowledge Management is one of the specific ITSM practices included in SDA v9. It sits alongside Incident Management, Problem Management, Service Request Management, and Information Security Management as core analyst knowledge. Knowledge-enabled self-service can reduce avoidable demand and improve customer experience. Therefore, the correct combination is 1, 3, and 4.