Which of the following answers is true?

> cor(df) Age Wage Experience Age X1 0.55 0. 76 Wage X2 X4 X5 Experience X3 0. 31 X6 Which of the following is true? Hint: Write out what the values of X1 through X6 are before answering the question. Double Hint: X1 is the correlation between the variables Age and Age. The same idea applies to all the other X's. O X1, X4, and X6 are all equal. O X2 is less than X5. O X2 is greater than X3. O X5 is equal to 1