Which function is used to retrieve the class of an instance?class()type()isinstance()getattr()

The function used to retrieve the class of an instance in Python is type().

Here's a brief explanation of each option:

1. class(): This is not a valid built-in function in Python; it is a keyword used for defining classes.

2. type(): This function returns the type or class of an object or instance. For example, type(instance) would return the class of the instance.

3. isinstance(): This function checks if an object is an instance of a specified class or a tuple of classes. It does not return the class itself but rather a boolean indicating whether the instance is of the given type.

4. getattr(): This function is used to retrieve an attribute from an object, not its class.

Therefore, the correct choice is type().