engineering recuitment FSSAI Technical Officer & Central Food Safety Officer Mock Test 2021 Computer Awareness Operating Systems

ਇਹਨਾਂ ਵਿੱਚੋਂ ਕਿਹੜਾ ਮੋਬਾਈਲ ਓਪਰੇਟਿੰਗ ਸਿਸਟਮ ਹੈ?

1
ਵਿੰਡੋਜ਼
2
ਸੋਲਾਰਿਸ ਓ.ਐਸ
3
MS Dos
4
Android OS
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