Microservice patterns

Which of the following statement(s) is/are true with respect to the microservice patterns?

NOTE: More than one option may be correct.

1) Aggregator invokes multiple services to achieve the functionality required by the application.

2) Proxy service acts as an interface and provides an extra layer of security for all API calls.

3) In the Chained pattern, the output of one service becomes the input for another service.

4) Asynchronous messaging cannot service the requests concurrently.

please provide the right solution.