单选题：A file system uses a two-level indexed allocation scheme. If the

A file system uses a two-level indexed allocation scheme. If the size of each block is 1KB, and the block address is 4 bytes, then the maximum length of a file that this system can support is approximately ____ .@[B](1)
A. 16MB
B. 64M B
C. 128MB
D. 256MB





A.16MB
B.64M B
C.128MB
D.256MB


答案：B