A group of students were given the names of eight countries and their current presidents in two columns. Each student is expected to match the eight countries with their respective presidents. A student is awarded 3 marks for each correct match. What is the maximum possible number of students who give different sets of valid responses and end up getting 15 marks?
1. 56
2. 112
3. 56×3!
4. 56×3!/2!

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