Consider the given code:

D1={1: 'India', 2: 'Russia', 3: 'World'}
D2={'School' : 'EOIS' , 'Place ' : 'Moscow'}
print(D1.update (D2) )

What will be the output of the above code:

1. None
2. {1: 'India' , 2: 'Russia' , 3: 'World' , 'School' : 'EOIS' , 'Place' : 'Moscow'}
3. Error
4. None of these

Assertion (A): Dictionary is a collection of key-value pairs.

Reasoning (R): Each key in a dictionary maps to a corresponding value. Keys are unique and act as the index.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): The popitem() method can be used to delete elements from a dictionary.

Reasoning (R): The popitem() method deletes the last inserted key-value pair and returns the value of deleted element.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Keys of the dictionaries must be unique.

Reasoning (R): The keys of a dictionary can be accessed using values.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.