Assertion. A dataframe is a 2D data structure which is value mutable and size mutable.

Reason. Every change in a dataframe internally creates a new dataframe object.

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 dataframe is value mutable and size-mutable.

Reason. All changes occur in-place in a dataframe.

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. Arithmetic operations on two series objects take place on matching indexes.

Reason. Non-matching indexes are removed from the result of arithmetic operation on series objects.

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. Arithmetic operations on two series objects take place on matching indexes.

Reason. For non-matching indexes of series objects in an arithmetic operation, NaN is returned.

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.