Which of the following statements is FALSE about keys in a relational database?

1. Any candidate key is eligible to become a primary key.
2. A primary key uniquely identifies the tuples in a relation.
3. A candidate key that is not a primary key is a foreign key.
4. A foreign key is an attribute whose value is derived from the primary key of another relation.

Fill in the blank:

In case of …………… switching, before a communication starts, a dedicated path is identified between the sender and the receiver.

Assertion(A): List is an immutable data type.

Reasoning(R): When an attempt is made to update the value of an immutable variable, the old variable is destroyed and a new variable is created by the same name in memory.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, and 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): Python Standard Library consists of various modules.

Reasoning(R): A function in a module is used to simplify the code and avoids repetition.

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