How do you control the size of the buffer that contains data extracted from?

How do you control the size of the buffer that contains data extracted from?

A.
TRANLOGOPTIONS ASMBUFSIZE

B.
DBOPTIONS ASMBUFSIZE

C.
TRANLOGOPTIONS BUFSIZE

D.
DBOPTIONS BUFSIZE

Explanation:
Reference :
http://download.oracle.com/docs/cd/E15881_01/doc.104/gg_wux_ref_v104.pdf