Remittance and collection are two kinds of______ credit

Remittance and collection are two kinds of______ credit while L/C belongs to______ credit .
A、banker's，commercial
B、commercial，banker's
C、commercial，commercial
D、banker's，banker's
【正确答案】：B
【题目解析】：本考查外贸常识。句意：汇款和托收是商业信用的两种形式，而信用证属于银行信用。