How to know if mysql server is using sha_256 or caching_sha_256 authentication plugin?

Seems like I am using an older version on Mysql Server which uses sha_256 plugin for Authentication (which is now deprecated) .Because of this, I am unable to connect to my server with third party softwares like beekeper studio. But I am able to connect from the terminal itself. So I went through the [Mysql manual](https://dev.mysql.com/doc/refman/8.0/en/sha256-pluggable-authentication.html) . It shows how to change the default authentication plugin , but before changing it, I just want to know what is my default authentication plugin. How to do that?