What level of C4 will be used for the diagram?

For diagrams, level C4 is usually chosen depending on the goal and audience:

• Context (Level 1) — shows the system in its environment, interactions with external users and systems. Suitable for high-level understanding.
• Container (Level 2) — reveals the main containers within the system (applications, databases, services) and their interactions.
• Component (Level 3) — details the internal components of containers.
• Code (Level 4) — the most detailed level, shows the code structure.

For most systems analysts and middle+ level professionals, the Container level (Level 2) is usually optimal, as it balances detail and overview, allowing understanding of architecture and interactions without excessive code detail.