RESTCONF is a network management protocol based on HTTP that provides a programmatic interface for accessing data defined in YANG, using the datastores defined in NETCONF. Among the options provided, HEAD and PATCH are valid operations for RESTCONF. The HEAD method is used for reading the metadata of a resource without fetching the resource itself, while the PATCH method is used for applying partial updates to a resource. References: Implementing and Operating Cisco Service Provider Network Core Technologies source documents or study guide.