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对于关系模式:教师授课(教师号,课程号,授课时数,学年,学期),假设一名教师在同一学年和学期可以讲授多门课程,也可以在不同学年和学期多次讲授同一门课程,对每门课程的讲授一个授课学时。 该关系模式的主码是( )。A.
（教师号，课程号，学年，学期）
B.
（教师号，课程号）
C.
（教师号，课程号，学年）
D.
（教师号，课程号，学期）
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