Which Compiler for Study.com's Programming in C????

[Merlin]

Based on some previous posts it looks like I should avoid Dev C++ (which is too bad because I like the IDE).

Any idea what compiler the graders at Study.com typically use?

Would the best/safest bet be GCC? If so can anyone also recommend a lightweight IDE? By "lightweight" I mean anything that is faster and less of a memory hog than Visual Studio 

I'm pretty sure that the evaluators use GCC in both instances, so I ended up using GCC/C++ (technically LLVM/clang) for both my SL C++ and SDC C Programming courses and didn't have any problems.

Both are free and easy to set up as well. I use a Mac so the compiler is native, but I'd set up a virtual machine running Linux if I were going to do this on my Windows PC.