When Personal Computers Were Beginning to Be Widely Used,there Were

Multiple Choice

When personal computers were beginning to be widely used,there were several operating systems that were being used on different kinds of computers;Microsoft used MS DOS,then an expanded version which include Windows,Apple used OS2,etc. Obviously,the Microsoft software became the "industry standard." This represents which concept named below?

A) Radical breakthroughs.
B) The S Curve.
C) The Early Adopters.
D) Technical Standard.
E) Core Rigidities.