I am looking for more information than what is published at the URL below to understand how this works. For example if I were to use the example does that mean that the best option is used on the list? If urandom is available it is used, but if not it would use random and if that was not available it would fall back to builtin? (Excluding truerand since it is now available on my system.)
https://httpd.apache.org/docs/2.4/mod/mod_ssl.html#sslrandomseed
