To be more specific on the previous question asked:

if I switch on my mobile data for a period of 30 seconds, then switch if off, actual amount of data transacted (include both upload and download) is 31.502k byte, what is the amount of data usage capture by your system?

A. 31.502 k byte (block of 1 byte)
B. 32.000 k byte (block of 1k byte)
C. 40.000 k byte (block of 10k byte)
D. 100.000k byte (block of 100k byte)
E. 1 M byte (block of 1Mega Byte)