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

निम्नलिखित में से कौन-सा एक मोबाइल ऑपरेटिंग सिस्टम है?

1
विंडोज
2
सोलारिस OS
3
MS Dos
4
एंड्रॉयड OS
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