Here are the entire contents of the file 'test.txt':

one two three

What is the value of 's' after these statements are executed? infile = open('test.txt', 'r') s = infile.readline() s = infile.readline() s = infile.readline() s = infile.readline() infile.close()

''

'three'

'three '

'one two '

'one two three'