List can be used as keys in a dictionary.

Updating an element in a dictionary at runtime is possible.

Which of the statement(s) is/are correct?

1. In Python dictionary, the key-value pair is called an item.
2. Python dictionary is a mapping of unique keys to values.
3. Dictionary is mutable.
4. All of these.

To create an empty dictionary, we use the statement as:

1. d1 = {}
2. d1 = []
3. d1 = ()
4. d1 == {}