Microsoft Azure Developer Associate AZ-204 Practice Question

The Cosmos DB output binding can create one document by using an out parameter, but when the function needs to add an arbitrary number of documents you must use IAsyncCollector (or ICollector). The collector lets you call AddAsync for each document and the runtime writes all items when the function completes, without any direct use of the Cosmos DB SDK. Declaring a single out parameter limits the function to exactly one document per invocation, while placing a DocumentClient parameter means you are bypassing bindings and writing code manually. Decorating an ILogger parameter with a Cosmos DB attribute would have no effect because ILogger is reserved for logging and cannot act as a binding target.