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Planet Design​ Services, Inc., is considering replacing a machine. The following data are​ available: Old Machine Replacement Machine Original cost $ 630 comma 000 $ 490 comma 000 Useful life in years 8 4 Current age in years 4 0 Book value $ 350 comma 000 long dash Disposal value now $ 162 comma 000 long dash Disposal value in 4 years ​$0 ​$0 Annual cash operating costs $ 108 comma 000 $ 66 comma 000 For the decision to keep the old​ machine, the relevant costs of keeping the old machine is​ ________.
A. $ 432 comma 000.
B. $ 640 comma 000.
C. $ 108 comma 000.
D. $ 594 comma 000.