Given below are two statements one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Laghu, Guru, Yati, Virāma, Gaņa - these are related to Chandas-Śāstra
Reason (R): The mantra “Pāvakā naḥ sarasvati” is in a Laukika metre (Chandas)