Integrated Development Environment (IDE) is software set that combines the tools that are required for the writing and testing of a particular software. It mainly has components like compiler, GUI (graphical user interface),editor, interpreter,debugging tool for the programs etc. It helps in the development by using these development tools in a single application.
If complete information means it has evidence and data as well as information and observations then yes, that is your answer. If it does not, then D would be your answer
RUP or Rational Unified Process is an IBM's software that divides the development process in four phases. It was developed to work throughout the entire software development life cycle, it's adaptive.
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Andrew likely does this to convey a <em>point </em>easily. Bullet points offer a way to explain a topic, but in simple sentences that when all add up, explain it. They're meant to be short and sweet, and don't make the reader lose their attention.