The Open Web Application Security Project (OWASP) is a group that monitors web attacks.
OWASP maintains a list of the top 10 attacks on an ongoing basis. This group also holds regular meetings at chapters throughout the world, providing resources and tools including testing procedures, code review steps, and development guidelines.

Platform as a Service (PaaS) As distinct from SaaS though, this platform would not be configured to actually do anything. Your own developers would have to create the software (the CRM or e?commerce application) that runs using the platform. The service provider would be responsible for the integrity and availability of the platform components, but you would be responsible for the security of the application you created on the platform.

Answer B is incorrect, there's no information about the server version
Answer C is incorrect, there's no SPF records here
Answer D is incorrect. Usually the secondary MX record is simply a different route to the same server.
Answer A is correct, 192.168.x.x is a private IP address and should not be displayed publicly.