Which type of compression would be most appropriate to use?

The data block density for a particular BSO database is between 10% and 90%, and data
values within the clock do not consecutively repeat. Which type of compression would be
most appropriate to use?

A.
Bitmap

B.
RLE

C.
ZLIB

D.
No compression required

Explanation:
http://knowhyperion.wordpress.com/http://www.mioaug.org/Presentations09/Internal%20Workings%20of%20EssbaseASO%20&%20BSO%20Secrets%20Revealed%20MIOAUG.pdf