নিচের কোনটি সিস্টেম সফটওয়্যার?
A. উইন্ডোজ ভিস্তা
B. এমএস এক্সেল
C. ওরাকল
D. নোটপ্যাড
সঠিক উত্তরঃ
A.
উইন্ডোজ ভিস্তা
Explanation:
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