To ensure that a connection is closed, you could provide a _____block in your code.a)anonymousb)catchc)tryd)finally

The correct answer is d) finally.

In Java, a finally block is a block that is used to execute important code such as closing connection, stream etc. It is always executed whether an exception is handled or not. So, to ensure that a connection is closed, you could provide a finally block in your code.

Here is a step by step guide on how you can do it:

1. First, you need to open your connection inside a try block. This is where you will put the code that might throw an exception.

2. Then, you need to catch the exception inside a catch block. This block will handle the exception if one is thrown in the try block.

3. Finally, you need to close your connection inside a finally block. This block will always be executed, regardless of whether an exception was thrown or not. This ensures that your connection is always closed.

Here is an example:

Connection conn = null;

try {
    conn = DriverManager.getConnection(DB_URL, USER, PASS);
    // Use the connection here
} catch(SQLException se) {
    // Handle errors for JDBC
    se.printStackTrace();
} catch(Exception e) {
    // Handle errors for Class.forName
    e.printStackTrace();
} finally {
    // Finally block used to close resources
    try {
        if(conn!=null)
            conn.close();
    } catch(SQLException se) {
        se.printStackTrace();
    }
}

In this example, the connection is closed in the finally block, ensuring that it is closed regardless of whether an exception was thrown or not.