Multiple versions of Unix exist because
A) Availability of choices is good for customers
B) Unix and Linux are not maintained
C) Availability of versions improved the competitiveness of Unix against Windows
D) AT&T licensed many institutions to create their own versions

Question

Quizplus · Accepted Answer

AT&T initially licensed Unix to several institutions, allowing for various versions of Unix to be developed. This led to a proliferation of Unix derivatives, each with their unique features and target markets. This approach was beneficial for the development of the Unix ecosystem, but it also created compatibility issues between different versions of Unix.

Multiple Versions of Unix Exist Because