Which of the following statement with regard to the UML association below is NOT proper? [Day] 1 ----> 6 [Note] a. Need to add a collections of object class Note to class Day b. Need to add the object of class Day in class Note and add a collection of objects of class Note to class Day c. Note class does not not necessarily "know" about the Day class d. Need to add a collection of pointers of class Note to class Day