I want to solve these questions from this uml.

-activities > Course p4 id: String name: String level int Course(String, String,int) Course(String, String, int, Activityd) addActivity (Activity):void setActivities(ActivityI):void equals(Course):boolean toString(:String > CA Activity p1 code: int max_Student_Number: int crdH_A: int of Activity(int,int,int) getResources():String getMax_Student_Number():int toString():String equals(Activity):boolean 0... > Lab p2 oStype: String software: String Lab(int, int, int, String) getResources(): String toString():String equals(Lab):boolean > Lecture p2 Stype: String Lecture(int,int,int) getResources():String toString():String a) Give the name of the relation between class Course and class Activity? b) Give the name of the relation between class Activity and class Lab? c) Give the name of a special behavior having the same name as the name of class? d) Why the behavior getResources() in class Activity is declared Abstract? e) Both classes "Lab" and "Lecture" possess one function with same name, but each having different behavior. Give the name of such java concept? f) Why Class Activity is declared Abstract