A field that gives each record a unique identity is called as :
एक फील्ड जो प्रत्येक रिकॉर्ड को एक विशिष्ट पहचान देता है, कहलाता है :
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Correct answer: C. Primary key
Explanation
A primary key uniquely identifies each record and cannot be NULL.
प्राइमरी की हर रिकॉर्ड को अद्वितीय पहचान देती है और NULL नहीं हो सकती।
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