Question: You are writing a Java program to manage a shared resource, such as a database connection pool. You want to ensure that only one instance

You are writing a Java program to manage a shared resource, such as a database connection
pool. You want to ensure that only one instance of the resource is created and shared among
all the classes in the program. Which of the following is a valid implementation of the
singleton design pattern in Java?
You are writing a Java program to manage a shared resource,

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