Question: What is the primary purpose of using final with a variable in Java?

A) To ensure that the variable cannot be changed once it is initialized, making it effectively read-only.
B) To indicate that the variable's value will be computed dynamically each time it is accessed.
C) To mark the variable as eligible for garbage collection once it is no longer referenced.
D) To enable the variable to be accessed or modified directly by subclasses, overriding any encapsulation constraints.