निम्नलिखित में से कौन सा एक ओपन-सोर्स ऑपरेटिंग सिस्टम नहीं है?
Which among the following is NOT an open-source operating system?
A)
B)
C)
D)
Explanation:
The correct answer is:
(B) Windows
Windows is not an open-source operating system, whereas Ubuntu, Linux, and Drupal are open-source.