Question: 21. (5 points) Reference manipulation. Write the specified lines of code that can realize the given memory map. Assume that the data field of Node

 21. (5 points) Reference manipulation. Write the specified lines of code

21. (5 points) Reference manipulation. Write the specified lines of code that can realize the given memory map. Assume that the data field of Node contains "int item;" and "Node next;". (Three-line code) (1) Node a = new Node(1); (2) (2) (3) a = b; (Two-line code) (1) Node a = new Node(1); (2) (Three-line code) (1) Node a = new Node(1); AD (3) (2) Node b = new Node(2); (3) (One-line code) (4) (One-line code) (5) 01.10

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