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Explanation required for this answer

 
Greenhorn
Posts: 9
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The explanation of answer to question 8 for Self Test for Chapter 7 from K&B for SCJP 6 is not clear. Here is the question:

Given a method declared as
public static <E extends Number> List<E> process(List<E> nums)
A programmer wants to use this method like this
// INSERT DECLARATIONS HERE
output = process(input);
Which pairs of declarations could be placed at // INSERT DECLARATIONS HERE to allow
the code to compile? (Choose all that apply.)

A. ArrayList<Integer> input = null;
ArrayList<Integer> output = null;

B. ArrayList<Integer> input = null;
List<Integer> output = null;

C. ArrayList<Integer> input = null;
List<Number> output = null;

D. List<Number> input = null;
ArrayList<Integer> output = null;

E. List<Number> input = null;
List<Number> output = null;

F. List<Integer> input = null;
List<Integer> output = null;

G. None of the above
 
Ranch Hand
Posts: 537
Eclipse IDE Python Java
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Please search the forum for an existing thread. Its already explained here
 
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