'What version of JRE should I use to run a Java 15 compiled program?

I am new to Java Programming. Recently I created a JavaFX program using the latest JDK 15 (https://www.oracle.com/java/technologies/javase-downloads.html) and the latest JavaFX SDK 15 (https://openjfx.io/index.html). Suppose that I need to deploy the application (.jar) in someone else's computer.

What is the version of JRE which should be in the client's PC? Or does he need to install complete JDK?
My program contains VM options so that can I embed them within the .jar file?
Are there specific JREs for version after Java 8? Or is the JRE coupled with the JDK itself?

java javafx

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