What is the output of the following? x = 'abcd' for i in range(len(x)): i.upper() print (x) a) a b c d b) 0 1 2 3 c) error d) none of the mentioned

What is the output of the following? x = 'abcd'  for i in range(len(x)):   i.upper()  print (x)  a) a b c d  b) 0 1 2 3  c) error  d) none of the mentioned
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Answer :

c) error
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