Which two statements are true about synchronous and asynchronous messageconsumption?

When asynchronously receiving messages, the consumer remains blocked until a message arrives.

The consumer can receive messages synchronously by registering a synchronous message listener to receive the messages.

For asynchronous consumption, a message listener can be implemented that serves as an asynchronous event handler for messages.

For synchronous consumption, the message consumer explicitly invokes a receive call on the topic or queue.