Which transaction would least likely be classified as an interest rate swap()

A. Pay USD fixed, receive U. S. LIBOR. 

B. Receive AUD fixed, pay NZD floating. 

C. Receive U. S. fixed, pay U.S. commercial paper.

设学生选课关系模式为SC(Sno，Cno，Grade)，其中Sno为学号，Cno为课程号，Grade为成绩，SOL杳询语句如下：
与该查询等价的元组演算表达式为t｜ (13) (SC(u)∧SC(v)∧ (14) ∧t[1]=u[1])。