A. Create an EMR security configuration and ensure the security configuration is associated with the EMR clusters when they are created.
B. Check the security group of the EMR clusters regularly to ensure it does not allow inbound traffic from IPv4 0.0.0.0/0 or IPv6 ::/0.
C. Enable the block public access setting for Amazon EMR at the account level before any EMR cluster is created.
D. Use AWS WAF to block public internet access to the EMR clusters across the board.
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