Course$($course$\_$id$,$sec$\_$id$,$semester$),$ Here the course$\_$id$,$sec$\_$id and semester are $\_\_\_\_\_\_\_\_\_\_$ and course is a $\_\_\_\_\_\_\_\_\_.$

Select one:

a$.$

Relations, Attribute

b$.$

Attributes, Relation

c$.$

Tuple, Relation

d$.$

Tuple, Attributes