Attention is called to the fact that in many cases charted depths may be decreased by up to（）.

A.one natutical mile

B.2 kilometers

C.5 cables only

D.one fathom

持票人申请贴现时，须提交贴现申请书，经其背书的（）商业汇票，持票人与出票人或其前手之间的增值税发票和商品交易合同复印件。