European currency options can be exercised _______; American currency options can be exercised _______.
A. any time up to the expiration date; any time up to the expiration date
B. any time up to the expiration date; only on the expiration date
C. only on the expiration date; only on the expiration date
D. only on the expiration date; any time up to the expiration date
Answer: Option D
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