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

ਇੰਨ੍ਹਾਂ ਵਿੱਚੋਂ ਕਿਹੜਾ ਇੱਕ ਓਪਰੇਟਿੰਗ ਸਿਸਟਮ ਨਹੀਂ ਹੈ?

1
ਐਂਡਰਾਇਡ (Android)
2
ਸਿੰਬੀਅਨ OS (Symbian OS)
3
ਫਾਇਰ ਫਾਕਸ (Fire fox)
4
iOS
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