Which feature is supported by NETCONF but is not supported by SNMP?

A (Distinguishing between config and operational data):NETCONF was designed to provide structured data models (such as YANG), clearly separating configuration from operational state data. SNMP lacks this built-in distinction and generally treats all data as MIB objects.

Other options explained:

B/C/D: Both protocols can perform actions and retrieve or modify data, but only NETCONF natively differentiates config vs. operational state.