Among the following, in Java, which is the most appropriate way to implement an iterator for a collection C? a) As a class external to C.
b) As a subclass of C.
c) As an inner class of C.
d) As a class external to C, but with in the same package as C.

When running anti-virus software , what could be a reason where recipitent is not guaranteed that data being streamed will not get interrupted?

Write a method named addall that could be placed inside the hashintset class. this method accepts another hashintset as a parameter and adds all elements from that set into the current set, if they are not already present. for example, if a set s1 contains [1, 2, 3] and another set s2 contains [1, 7, 3, 9], the call of s1.addall(s2); would change s1 to store [1, 2, 3, 7, 9] in some order. you are allowed to call methods on your set and/or the other set. do not modify the set passed in. this method should run in o(n) time where n is the number of elements in the parameter set passed in.

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