Which of the following is an incorrect formula involving t?

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Which of the following is an incorrect formula involving ot? Possible Answers A The PV at t1 of $1 due at to is = a (t1) a (t2) where a ( t ) = efoordr B The PV at t1 of $1 due at to is = e- Sty didt C The AV at t2 of $1 invested at t1 is = a (t2) a (t1) where a (t) = efoordr D The AV at t2 of $1 invested at t1 is = eJo- (t2 8+ dt E A (t2) = A(t1) efti didt , where ti