SSC Delhi Police Constable 2025 Mock Test Series (New) Computer Awareness Operating Systems

ਇਹਨਾਂ ਵਿੱਚੋਂ ਕਿਹੜਾ ਇੱਕ ਓਪਨ-ਸੋਰਸ ਓਪਰੇਟਿੰਗ ਸਿਸਟਮ ਨਹੀਂ ਹੈ?

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ਵਿੰਡੋਜ਼
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ਉਬੰਟੂ
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ਐਂਡਰਾਇਡ
4
ਲੀਨਕਸ
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