Which URI should be used for the Batching REST resource?

The Batching REST resource in Salesforce is accessed via the URI that includes the term "composite/batch." This structure is designed to handle multiple requests in a single HTTP call, which is essential for efficient data operations. The "composite" endpoint indicates that this resource can handle complex requests that may involve multiple entity types, and the "batch" segment specifies that this particular URI is used for executing batches of requests.

Using /services/data/v37.0/composite/batch allows you to send multiple API requests wrapped in a single call, which helps to reduce the number of network calls needed when interacting with Salesforce and can lead to better performance and lower latency when dealing with high volumes of data.

The other options do not follow this correct structure or are not designated for batching. For instance, the URI that ends with "/batch" doesn't specify it as a composite operation, which is critical for batching functionality. Thus, the choice /services/data/v37.0/composite/batch is the accurate URI for accessing the Batching REST resource.