Which two operations are valid for RESTCONF?

RESTCONF leverages standard HTTP methods for its operations. PATCH is a valid HTTP method used to apply partial modifications to a resource, which is a common requirement for configuring network devices. HEAD is another valid HTTP method that requests the headers that would be returned if the HEAD request's URL were instead requested with a GET method. This is useful for retrieving metadata about a resource without transferring the entire resource body. PULL, PUSH, REMOVE, and ADD are not standard HTTP methods and therefore are not directly used as operations in RESTCONF. While their functionalities might be achieved using other HTTP methods (e.g., DELETE for REMOVE, POST/PUT for ADD/PUSH), they are not the methods themselves.