The length of a daphnid tail spine was measured as 65 ocular micrometer units at 40X total magnification. If 1 ocular micrometer unit equals 25 μm at this magnification, what would be the actual length of the tail spine?
A) 1625 μm
B) 650 μm
C) 2.6 μm
D) 1.625 μm