(A) (T2 – T1)/T2
(B) (T2 – T1)/T1
(C) (T1 – T2)/T2
(D) (T1 – T2)/T1
(A) (T2 – T1)/T2
(B) (T2 – T1)/T1
(C) (T1 – T2)/T2
(D) (T1 – T2)/T1
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