A. Apple
B. Netflix
C. Microsoft
D. IBM

Solution

C. Microsoft

Explanation

.NET, a software framework developed by Microsoft, was primarily led by Microsoft's development team. The development of .NET was spearheaded by Microsoft's Developer Division, under the leadership of Anders Hejlsberg. Anders Hejlsberg is a Danish software engineer and has been a key figure in the development of several programming languages, including Turbo Pascal, Delphi, and C# (which is a key language in the .NET framework).