当信用证表示发票含折扣时，发票金额和汇票金额的关系为（）。

A.SAY HONGKONG DOLLARS FIFTY EIGHT THOUSAND SIX HUNDRED AND SEVENTY THREE CENTS FIFTY SIX ONLY.
B.SAY HONGKONG DOLLARS FIFTY EIGHT THOUSAND SIX HUNDRED AND SEVENTY THREE 56/100.
C.HONGKONG DOLLARS FIFTY EIGHT THOUSAND SIX HUNDRED AND SEVENTY THREE POINT FIFTY SIX ONLY.
D.SAY HONGKONG DOLLARS FIFTY EIGHT THOUSAND SIX HUNDRED AND SEVENTY THREE 56%.

A.运输单据日期前3天
B.运输单据日期后3天
C.发票日期前3天
D.发票日期后3天