Read the assertion and reason statements and choose the correct answer:
1. Assertion (A): The SI unit of time is the \(second\).
Reason (R): One minute is equal to \(60\ seconds\).
Reason (R): One minute is equal to \(60\ seconds\).
2. Assertion (A): Atomic clocks are useful when highly precise measurement of time is required.
Reason (R): Atomic clocks use highly regular atomic processes as a precise reference for measuring time.
Reason (R): Atomic clocks use highly regular atomic processes as a precise reference for measuring time.