Teaching KVS Junior Secretariat Assistant (LDC) Mock Test 2022 Computer Awareness Operating Systems

ਇਹਨਾਂ ਵਿੱਚੋਂ ਕਿਹੜਾ ਸਿੰਗਲ - ਯੂਜ਼ਰ ਓਪਰੇਟਿੰਗ ਸਿਸਟਮ ਹੈ?

1
MS - DOS
2
UNIX
3
XENIX
4
ਦੋਵੇਂ (A) ਅਤੇ (C)
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