D. Amazon Trust Advisor
Security Groups - Specific Ports Unrestricted (Free!)
Checks security groups for rules that allow unrestricted access (0.0.0.0/0) to specific ports. Unrestricted access increases opportunities for malicious activity (hacking, denial-of-service attacks, loss of data). The ports with highest risk are flagged red, and those with less risk are flagged yellow. Ports flagged green are typically used by applications that require unrestricted access, such as HTTP and SMTP.
Ref link: https://www.amazonaws.cn/en/support/trustedadvisor/best-practices/
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