An engineer uses Nexus API to get the output of the running configuration of a...

The correct answer is A because Cisco Nexus 9000 Series switches use JSON-RPC 2.0 format for NX-API requests when interacting programmatically. In this format, the required fields include jsonrpc, method, params, and id. To retrieve operational or configuration data using a show command, Cisco specifies the use of the method cli_show, which is designed for read-only commands such as show running-config.

The params section must include the command (cmd) and the API version (version: 1). This aligns with Cisco NX-API documentation, where cli_show ensures that the output is returned without modifying the system.

Option D is incorrect because the method cli is used for configuration commands, not show commands. Options B and C are invalid because they use JSON-RPC 1.0 format, which is not supported in modern NX-API implementations for Nexus 9000 switches.

Therefore, the properly structured JSON-RPC 2.0 request using cli_show is required to retrieve the running configuration, making A the correct answer.