A particular disk unit uses a bit string to record the occupancy or vacancy of its tracks, with 0 denoting vacant and 1 denoting occupied. A 32-bit segment of this string has the hexadecimal value D4F E2003. The percentage of occupied tracks forthe corresponding part of the disk, to the nearest percent, is
A. 12
B. 25
C. 38
D. 44
E. 62