Which statement correctly describes a YANG characteristic?

YANG (Yet Another Next Generation) is a data modeling language used to model configuration and state data, notifications, and RPCs for network devices. It is not Cisco proprietary; it is an IETF standard (RFC 6020, RFC 7950). A key feature of YANG is its extensibility, which includes the ability for model developers to define custom data types using the typedef statement. This allows for more precise and semantically rich data models. While YANG models data hierarchically, it is not strictly object-oriented in the traditional programming sense, nor does it provide control flow constructs like loops or conditionals; those are functions of the network device's operating system or management applications interacting with the YANG model.