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Select from among the following, the correct statement(s) related to state transition diagrams. Select one or more: a. A statechart diagram describes the life of one object in terms of the events which trigger changes in the object's state. b. A statechart diagram models the events which trigger a transition from one state to another state. c. A statechart diagram identifies both the external events and internal events which can change the object's state. d. An event on a statechart diagram corresponds to a message on a sequence diagram. e. The following are the two UML symbols used for initial and final states and these are two special states which may be defined for an object's state machine. Final State