The Python library commonly used for NETCONF automation is ncclient. NETCONF is an XML-based network management protocol that uses YANG data models to structure configuration and operational state. The ncclient library provides Python functions for connecting to NETCONF-capable devices, opening a manager session, issuing get, get-config, edit-config, and other NETCONF operations, and processing XML responses. Option A is correct. The requests library is commonly used for REST API calls over HTTP or HTTPS, such as RESTCONF or controller northbound APIs, but it is not the standard NETCONF client library. Postman is an API testing application, not a Python library. cURL is a command-line tool for sending HTTP and other protocol requests, not a Python library for NETCONF/YANG workflows. In ENCOR automation, the distinction matters: REST-based APIs often use JSON and HTTP methods, while NETCONF uses XML-based RPC operations over SSH and is commonly automated in Python with ncclient. References/topics: ENCOR Automation, NETCONF, YANG, Python automation, ncclient, model-driven programmability.

The correct snippet is option B because json.dump(Devices, OutFile) serializes the Python data structure and writes the resulting JSON directly to the open file object. The file is opened in write mode with open( " devices.json " , " w " ), and OutFile.close() closes the file after writing. Option A is wrong because json.load() reads JSON from a file and converts it into a Python object; it does not write a Python object to disk. It is also being used on a file opened in write mode, which is logically incorrect. Option C writes str(Devices), which produces a Python string representation of the dictionary, not standards-compliant JSON. That output may use single quotes and Python-specific formatting, which is not proper JSON. Option D uses json.dumps(Devices), which returns a JSON-formatted string, but it does not write that string to the file because the return value is ignored. ENCOR automation questions often test the difference between dump, dumps, load, and loads. References/topics: ENCOR Automation, Python, JSON, json.dump(), json.dumps(), file output, API data formatting.

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