What is the main purpose of RStudio?

RStudio is the main integrated development environment for R.
It provides options for syntax, code completion, and smart indentation.
It allows us to execute R code directly from the source editor.
It provides help and documentation on R and the IDE.
It allows us to easily manage multiple working directories using projects.
It provides a powerful possibility for creating and debugging content.
It has integrated support for Git and Subversion.
It supports the creation of HTML, PDF, Word documents, and slide presentations.
It allows working with interactive graphics with Shiny and ggvis.
a) To provide a platform for executing programs written in Python.
b) To provide a platform for executing programs written in Java.
c) To provide a platform for executing programs written in C++.
d) To provide a platform for executing programs written in R.