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If A and B are symmetric (that is A? = A), which of the following are true: (i). A - B is symmetric. (ii) AB is symmetric. (iii) If A is invertible, A- is symmetric. (iv) B2 is symmetric. (V) ABT = BAT O (ii) and (iv) only O none of them are true O (i), (ii) and (iv) only O (i) and (ii) only O all of them are true O (ili) and (iv) only