Which of the following is the operating system?

MAC OSX
DOS
Windows 7
all listed
OS X is Apple's operating system that runs on Macintosh computers. DOS is a family of disk operating systems. Windows 7 is a personal computer operating system developed by Microsoft.
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Answers by country

MAC OSX
DOS
Windows 7
all listed
answers
flagSwitzerland
0%
0%
23%
76%
13
flagAustralia
6%
13%
6%
73%
15
flagthe United States
10%
17%
0%
71%
28
flagthe United Kingdom
8%
16%
8%
68%
25
flagPoland
5%
15%
13%
64%
2094
flagGermany
7%
11%
20%
60%
94
flagIndia
5%
21%
21%
52%
19
flagAustria
14%
21%
14%
50%
14