What is true about HashMap as a collection type?This collection type can contain duplicate values.If a value is added to this collection type that exists, it will not be checked first.This collection type uses index values to track data.This collection type uses key-value pairs to track data

HashMap is a collection type in Java that stores data in key-value pairs. Here are the answers to your statements:

1. "This collection type can contain duplicate values." - True. HashMap allows duplicate values but not duplicate keys.

2. "If a value is added to this collection type that exists, it will not be checked first." - False. If a value is added with an existing key, the old value will be replaced with the new one. The existence of the key is checked, not the value.

3. "This collection type uses index values to track data." - False. HashMap does not use index values to track data. It uses a key to get a value.

4. "This collection type uses key-value pairs to track data." - True. HashMap uses key-value pairs to store data. The keys are unique, and each key maps to a single value.