What is the module system introduced in Java 9?
a) A new package management system
b) A new type of class loader
c) A new concurrency library
d) A new garbage collector
Answer: a) A new package management system
Explanation: Java 9 introduced a module system that allows you to create a new kind of Java artifact called a module. A module is a group of related packages, and it provides better encapsulation and control over dependencies.
