Check the true statements about any class that implements the java. util Map interface. Interpret "first position of a pair" to mean the first parameter of a put() operation, and "second position of a pair" to mean the second parameter of a put() operation.
1. It allows for a criterion in which each member of the Map is unique in terms of a key: we can't have the same key appear more than once in Map.
2. We can specify whether the key appears in the first or in the second position of each pair stored in the Map.
3. We can remove as well as add elements to a Map.
4. If a Map contains a pair with the key 9999, any attempt to overwrite this pair will fail.
5. java. util provides some ready-made generic implementations of Map.