Which statement best defines the least common denominator (LCD) for rational expressions?

Any common multiple of the denominators that is divisible by each denominator and is less than or equal to the product of the denominators

The greatest common divisor of the denominators after factoring them completely

The product of every factor from each denominator, including repeated factors, multiplied together regardless of their exponents

The product of the unique prime and variable factors from all denominators, each raised to the highest exponent present