Ans:
a).Aggregation among objects
Aggregation among objects represents a relationship. It is a whole/part relationship. Aggregation may imply containment.
b).Class
A class is a template that specifies the properties of objects. Classes have an interface which consists of the operation, a body which implements the operations and instance variable which contain the state of an object.
c).Repeated inheritance
If a class inherits more than once from the same class then it is referred to as repeated inheritance.
d).Encapsulation
An object encapsulates the data and information it contains and supports a well defined abstraction. Encapsulation leads to the separation of the interface and implementation.
e).Scenario
A scenario is a sequence of events that occur in a particular execution of the system. A scenario can be described textually by enumerating the sequence of events or it can be shown as an event trace diagram in which events between
objects are shown.