Question : In Java, what is the primary purpose of the volatile keyword when used in thread programming?
A ) To ensure that a variable is not cached thread-locally, allowing changes made by one thread to be visible to others.
B ) To enforce mutual exclusion between threads for accessing critical sections of code.
C ) To initiate the garbage collection process on an object when it's no longer needed.
D ) To make a method non-blocking in terms of thread coordination.