Regarding Macaulay's duration and modified duration, pick the single incorrect option below: a. If the yield is compound monthly, the modified duration is equal to Macaulay's duration divided by one plus the yield divided by twelve. b. If the yield is compound continuously, the modified duration is equal to Macaulay's duration. c. If the yield is compound yearly, the modified duration is equal to Macaulay's duration divided by one plus the yield. d. If the yield is compound quarterly, the modified duration is equal to Macaulay's duration divided by one plus the yield divided by three.