The following line of code: for line in open(‘text.txt’, ‘rt’):

for line in open('text.txt', 'rt'):

• is invalid because open returns a non-iterable object
• is invalid because open returns nothing
• is valid because open returns an iterable object
• may be valid if line is a list

Explanation: The open() method returns an iterable object, which can be used to iterate through all the file’s lines inside a for loop.

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