1 The body of a while loop may never execute. True O False 2 There is no way to stop an infinite loop. True O False 3 In some cases, a sentinel value can be used to signal the end of input. O True False 4 Using a while loop to check each input value for correctness is a form of input validation. O True False 5 Which of the following is NOT a repetition statement in Python? O if statement O while statement O for statement O They are all repetition statements. 6 What causes an infinite loop? O A loop condition that is always false. O A loop condition that is never false. O A loop control variable that is repeatedly modified. O A loop body that is never executed. 7 What output is printed by the following code? str = 'Rephactor Python' index = 0 num = 0 while index