D. All of these
Reason being, they wouldn't have been made if something hasn't been discovered about them.
Answer:
When that information gets posted online, it is no longer private, and may end up falling into wrong hands. Even if you have put in place the highest possible security measures, some of your friends, colleagues and companies you interact with on social media, can end up leaking your personal information.
A vital part of any website project is the quality assurance stage. Prior to launch, final QA testing ensures that your site is working according to your expectations and that your site users won’t be frustrated with any non-functioning pages.
About a database. A data dictionary defines the structure of the database itself (not that of the data held in the database) and is used in control and maintenance of large databases. Among other items of information, it records (1) what data is stored, (2) name, description, and characteristics of each data element, (3) types of relationships between data elements, (4) access rights and frequency of access. Also called system dictionary when used in the context of a system design
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