Which of the following statements are true?
a. The Collection interface is the root interface for manipulating a collection of objects.
b. The Collection interface provides the basic operations for adding and removing elements in a collection.
c. The AbstractCollection class is a convenience class that provides partial implementation for the Collection interface.
d. Some of the methods in the Collection interface cannot be implemented in the concrete subclass. In this case, the method would throw java.lang.UnsupportedOperationException, a subclass of RuntimeException.
e. All interfaces and classes in the Collections framework are declared using generic type since JDK 1.5.
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