Which statement about dictionaries is true?

A. Dictionary keys must be mutable

B. Dictionary values must be immutable

C. Dictionary reserves insertion order only in Python 2

D. Dictionary keys must be unique

Correct Answer is :

D. Dictionary keys must be unique

Explanation

A dictionary cannot contain duplicate keys; a later value for the same key replaces the earlier one.

Dictionary में duplicate keys नहीं हो सकतीं; same key की नई value पुरानी value को replace करती है।