Which of the following is the valid domain name extension ?

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Submitted by examrobotsa on

Q: 62 (MPPSC/2012)

Which of the following is the valid domain name extension ?
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question_subject: 

Science

question_exam: 

MPPSC

stats: 

0,8,4,4,0,0,8

keywords: 

{'valid domain name extension': [0, 0, 0, 1]}