A file system uses a bitmap to keep track of free disk space. One bit represents a 512-byte block. The disk contains 3 files, in the order: A, B, C, with the respective sizes of 1040, 700, 2650 bytes. Which one below is the correct bitmap?

A. 0111000111111 ....
B.1111111100110 ...
C.1011101101100...
D. 1111111111100