Assertion (A): log_x (m x n x p) = log_x m + log_x n + log p.

Reason (R): The logarithm of a product at any non-zero base is equal to the sum of the logarithms of its factors at the same base.

1. A is true, R is false.
2. A is false, R is true.
3. Both A and R are true.
4. Both A and R are false.