Question: You have an instance of type Map named instruments containing the following key-value pairs: guitar=1200, cello=3000, and drum=2000. If you add the new key-value pair cello=4500 to the Map using the put method, how many elements do you have in the Map when you call instruments.size()?

1. 2
2. When calling the put method, Java will throw an exception
3. 4
4. 3

Answer: The correct answer of the above question is Option D:3