Question: Given the method public V put ( K k , V v ) { . . . } , suppose the map M holds

Given the method "public V put(K k, V v){...}", suppose the map M holds pairs and is currently empty. What is output by the following statement?
M.put('C', "cow");
System.out.println(M.put('C', "cow"));
Group of answer choices
nothing
null
true
false
cow

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