Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as. Assertion (A): Transition metals have high melting point. Reason (R): Transition metals have completely filled d-orbitals. a)Both A and R are true and R is the correct explanation of A. b)Both A and R are true but R is NOT the correct explanation of A. c)A is true but R is false. d)A is false and R is True.